Q 1 :

Read the passage given below and answer the following questions from (i) to (v).

When a small compass is placed near a magnet, it will experience a force due to the magnetic field of the magnet. It is evidently observed due to a deflection in the north pole pointer of the compass. The path traced by the north pole pointer under the influence of a magnetic field is called the magnetic field line. The magnetic field lines are produced from the north pole of the magnet end at the south pole of the magnet. When the compass is moved around the field line, it always sets itself tangential along the curves.

 

(i) The magnetic field lines:

• intersect at right angle to one another.

   

• intersect at an angle of 45 degree.

   

• cross at an angle of 60 degree

   

• never intersect with each other.

   

Q 2 :

Read the passage given below and answer the following questions from (i) to (v).

When a small compass is placed near a magnet, it will experience a force due to the magnetic field of the magnet. It is evidently observed due to a deflection in the north pole pointer of the compass. The path traced by the north pole pointer under the influence of a magnetic field is called the magnetic field line. The magnetic field lines are produced from the north pole of the magnet end at the south pole of the magnet. When the compass is moved around the field line, it always sets itself tangential along the curves.

 

(ii) Magnetic field lines can be used to determine:

• the shape of the magnetic field.

   

• only the direction of the magnetic field.

   

• only the relative strength of the magnetic field.

   

• both the direction and the relative strength of the magnetic field.

   

Q 3 :

Read the passage given below and answer the following questions from (i) to (v).

When a small compass is placed near a magnet, it will experience a force due to the magnetic field of the magnet. It is evidently observed due to a deflection in the north pole pointer of the compass. The path traced by the north pole pointer under the influence of a magnetic field is called the magnetic field line. The magnetic field lines are produced from the north pole of the magnet end at the south pole of the magnet. When the compass is moved around the field line, it always sets itself tangential along the curves.

 

(iii) The magnetic field lines due to a bar magnet are correctly shown in:

Q 4 :

Read the passage given below and answer the following questions from (i) to (v).

When a small compass is placed near a magnet, it will experience a force due to the magnetic field of the magnet. It is evidently observed due to a deflection in the north pole pointer of the compass. The path traced by the north pole pointer under the influence of a magnetic field is called the magnetic field line. The magnetic field lines are produced from the north pole of the magnet end at the south pole of the magnet. When the compass is moved around the field line, it always sets itself tangential along the curves.

 

(iv) Which of the following is incorrect regarding magnetic field lines?

• The field lines are directed N to S inside the magnet.
   

• The crowdedness of the field lines shows the strength of the magnet.
   

• The field is tangent to the magnetic field line.
   

• Magnetic field lines are closed and continuous curves.
   

Q 5 :

Read the passage given below and answer the following questions from (i) to (v).

When a small compass is placed near a magnet, it will experience a force due to the magnetic field of the magnet. It is evidently observed due to a deflection in the north pole pointer of the compass. The path traced by the north pole pointer under the influence of a magnetic field is called the magnetic field line. The magnetic field lines are produced from the north pole of the magnet end at the south pole of the magnet. When the compass is moved around the field line, it always sets itself tangential along the curves.

 

(v) A strong bar magnet placed vertically above a surface. The magnetic field lines will be:

• Only in a horizontal plane around the magnet.

   

• Only in a vertical plane around the magnet.

   

• Both in horizontal and vertical plane around the magnet.

   

• In all the planes around the magnet.

   

Q 6 :

Read the passage given below and answer the following questions from (i) to (v).

A current-carrying wire produces a magnetic field around it. The phenomena in which an electromotive force and current are induced by changing magnetic field through it is called induced current. It can be concluded that the induced current flows in a conductor as long as the magnetic force changes within the conductor. For the motion of the coil with respect to the magnet or vice versa, the direction of the current flowing in the conductor is determined by the direction of the relative motion of the conductor with respect to the magnetic field. The induced emf or current is directly proportional to the rate of change in the magnetic field.

(i) What is the condition of electromagnetic induction?

• There must be relative motion between galvanometer and coil of wire.

   

• There must be a relative motion between galvanometer and magnet.

   

• There must be a relative motion between galvanometer and electric motor.

   

• There must be a relative motion between the coil of wire and a magnet.

   

Q 7 :

Read the passage given below and answer the following questions from (i) to (v).

A current-carrying wire produces a magnetic field around it. The phenomena in which an electromotive force and current are induced by changing magnetic field through it is called induced current. It can be concluded that the induced current flows in a conductor as long as the magnetic force changes within the conductor. For the motion of the coil with respect to the magnet or vice versa, the direction of the current flowing in the conductor is determined by the direction of the relative motion of the conductor with respect to the magnetic field. The induced emf or current is directly proportional to the rate of change in the magnetic field.

(ii) An induced emf is produced when a magnet is plugged into a coil. The magnitude of induced emf does not depend upon:

• The number of turns in the coil.

   

• The speed with which the magnet is moved.

   

• The resistivity of the material of the coil.

   

• The strength of the magnet.

   

Q 8 :

Read the passage given below and answer the following questions from (i) to (v).

A current-carrying wire produces a magnetic field around it. The phenomena in which an electromotive force and current are induced by changing magnetic field through it is called induced current. It can be concluded that the induced current flows in a conductor as long as the magnetic force changes within the conductor. For the motion of the coil with respect to the magnet or vice versa, the direction of the current flowing in the conductor is determined by the direction of the relative motion of the conductor with respect to the magnetic field. The induced emf or current is directly proportional to the rate of change in the magnetic field.

(iii) A bar magnet is pushed steadily into a long solenoid connected to a meter. Which of the following would affect the magnitude of the deflection of the meter?

• How fast the magnet is pushed into the coil.

   

• Direction in which the coil is wound.

   

• End of the solenoid where the magnet enters.

   

• Pole of the magnet which enters the coil first.

   

Q 9 :

Read the passage given below and answer the following questions from (i) to (v).

A current-carrying wire produces a magnetic field around it. The phenomena in which an electromotive force and current are induced by changing magnetic field through it is called induced current. It can be concluded that the induced current flows in a conductor as long as the magnetic force changes within the conductor. For the motion of the coil with respect to the magnet or vice versa, the direction of the current flowing in the conductor is determined by the direction of the relative motion of the conductor with respect to the magnetic field. The induced emf or current is directly proportional to the rate of change in the magnetic field.

(iv) A conducting rod moves across two magnets as shown in the figure and the needle in the galvanometer deflects momentarily. This physical phenomenon is called:

• Induced magnetism

   

• Electromagnetism

   

• Static induction

   

• Electromagnetic induction

   

Q 10 :

Read the passage given below and answer the following questions from (i) to (v).

A current-carrying wire produces a magnetic field around it. The phenomena in which an electromotive force and current are induced by changing magnetic field through it is called induced current. It can be concluded that the induced current flows in a conductor as long as the magnetic force changes within the conductor. For the motion of the coil with respect to the magnet or vice versa, the direction of the current flowing in the conductor is determined by the direction of the relative motion of the conductor with respect to the magnetic field. The induced emf or current is directly proportional to the rate of change in the magnetic field.

(v) Magnetic lines of force inside current-carrying solenoid are:

• perpendicular to axis.

   

• along the axis and are parallel to each other.

   

• parallel inside the solenoid and circular at the ends.

   

• circular.

   

Q 11 :

Read the passage given below and answer the following questions from (i) to (iv).

Hans Christian Oersted, one of the leading scientists of the 19th century, played a crucial role in understanding electromagnetism. In 1820, he accidentally discovered that a compass needle got deflected when an electric current passed through a metallic wire placed nearby. Through this observation, Oersted showed that electricity and magnetism were related phenomena. This research later created technologies such as radio, television, and fibre optics. The unit of magnetic field was named as Oersted in his honour.

Electromagnetism is the study of electromagnetic force. It is a type of interface that happens between electrically charged particles. The electromagnetic force generally exhibits electromagnetic fields like magnetic fields, electric fields and light, and is known as one of the four essential interactions commonly known as forces in nature. The other 3 important interactions are the strong interaction, gravitation and the weak.

 

(i) Oersted experiment is used to explain which effect of current?

• Electric effect

   

• Magnetic effect

   

• Both (a) and (b)

   

• None of these

   

Q 12 :

Read the passage given below and answer the following questions from (i) to (iv).

Hans Christian Oersted, one of the leading scientists of the 19th century, played a crucial role in understanding electromagnetism. In 1820, he accidentally discovered that a compass needle got deflected when an electric current passed through a metallic wire placed nearby. Through this observation, Oersted showed that electricity and magnetism were related phenomena. This research later created technologies such as radio, television, and fibre optics. The unit of magnetic field was named as Oersted in his honour.

Electromagnetism is the study of electromagnetic force. It is a type of interface that happens between electrically charged particles. The electromagnetic force generally exhibits electromagnetic fields like magnetic fields, electric fields and light, and is known as one of the four essential interactions commonly known as forces in nature. The other 3 important interactions are the strong interaction, gravitation and the weak.

 

(ii) Which instrument helps to detect the presence of magnetic field at a point?

• Strong magnet

   

• Solenoid

   

• Compass needle

   

• Current carrying line

   

Q 13 :

Read the passage given below and answer the following questions from (i) to (iv).

Hans Christian Oersted, one of the leading scientists of the 19th century, played a crucial role in understanding electromagnetism. In 1820, he accidentally discovered that a compass needle got deflected when an electric current passed through a metallic wire placed nearby. Through this observation, Oersted showed that electricity and magnetism were related phenomena. This research later created technologies such as radio, television, and fibre optics. The unit of magnetic field was named as Oersted in his honour.

Electromagnetism is the study of electromagnetic force. It is a type of interface that happens between electrically charged particles. The electromagnetic force generally exhibits electromagnetic fields like magnetic fields, electric fields and light, and is known as one of the four essential interactions commonly known as forces in nature. The other 3 important interactions are the strong interaction, gravitation and the weak.

 

(iii) In the diagram below, the direction of magnetic field is:

• Clockwise

   

• Anti clockwise

   

• Not any fixed direction

   

• None of these

   

Q 14 :

Read the passage given below and answer the following questions from (i) to (iv).

Hans Christian Oersted, one of the leading scientists of the 19th century, played a crucial role in understanding electromagnetism. In 1820, he accidentally discovered that a compass needle got deflected when an electric current passed through a metallic wire placed nearby. Through this observation, Oersted showed that electricity and magnetism were related phenomena. This research later created technologies such as radio, television, and fibre optics. The unit of magnetic field was named as Oersted in his honour.

Electromagnetism is the study of electromagnetic force. It is a type of interface that happens between electrically charged particles. The electromagnetic force generally exhibits electromagnetic fields like magnetic fields, electric fields and light, and is known as one of the four essential interactions commonly known as forces in nature. The other 3 important interactions are the strong interaction, gravitation and the weak.

 

(iv) On reversing the direction of the current in a wire, the magnetic field produced by it:

• Gets reversed in direction

   

• Increase in strength

   

• Decreases in strength

   

• Remains unchanged in strength and direction

   

Q 15 :

Read the passage given below and answer the following questions from (i) to (v).

A magnet must exert an equal and opposite force on a current-carrying conductor. We know that current is due to the charge in motion. Thus, it is evident that a charge moving in a magnetic field experiences a force. If the direction of motion is perpendicular to the direction of the magnetic field, the magnitude of force experienced depends upon the charge, velocity, and strength of the magnetic field. Fleming’s left-hand rule gives the direction of the magnetic force.

(i) If a charged particle is moving along a magnetic field line, the magnetic force on the particle is:

• along with its velocity.

   

• opposite to its velocity.

   

• perpendicular to its velocity.

   

• zero

   

Q 16 :

Read the passage given below and answer the following questions from (i) to (v).

A magnet must exert an equal and opposite force on a current-carrying conductor. We know that current is due to the charge in motion. Thus, it is evident that a charge moving in a magnetic field experiences a force. If the direction of motion is perpendicular to the direction of the magnetic field, the magnitude of force experienced depends upon the charge, velocity, and strength of the magnetic field. Fleming’s left-hand rule gives the direction of the magnetic force.

(ii) An electron is travelling horizontally towards the east. A magnetic field in the vertically downward direction will exert a force in:

• East

   

• West

   

• North

   

• South

   

Q 17 :

Read the passage given below and answer the following questions from (i) to (v).

A magnet must exert an equal and opposite force on a current-carrying conductor. We know that current is due to the charge in motion. Thus, it is evident that a charge moving in a magnetic field experiences a force. If the direction of motion is perpendicular to the direction of the magnetic field, the magnitude of force experienced depends upon the charge, velocity, and strength of the magnetic field. Fleming’s left-hand rule gives the direction of the magnetic force.

(iii) A uniform magnetic field exists from left to right on a surface. An electron and proton moving in the directions as shown in the figure will experience:

• Forces both pointing into the plane of the surface.

   

• Forces both pointing out of the plane of the surface.

   

• The electron will experience into the plane and proton out of the plane.

   

• The electron will experience opposite to and proton along the direction of the uniform magnetic field.

   

Q 18 :

Read the passage given below and answer the following questions from (i) to (v).

A magnet must exert an equal and opposite force on a current-carrying conductor. We know that current is due to the charge in motion. Thus, it is evident that a charge moving in a magnetic field experiences a force. If the direction of motion is perpendicular to the direction of the magnetic field, the magnitude of force experienced depends upon the charge, velocity, and strength of the magnetic field. Fleming’s left-hand rule gives the direction of the magnetic force.

(iv) Magnetic field exerts no force on:

• a stationary electric charge.

   

• a magnet

   

• an electric charge moving perpendicular to its direction.

   

• an unmagnetized iron bar.

   

Q 19 :

Read the passage given below and answer the following questions from (i) to (v).

A magnet must exert an equal and opposite force on a current-carrying conductor. We know that current is due to the charge in motion. Thus, it is evident that a charge moving in a magnetic field experiences a force. If the direction of motion is perpendicular to the direction of the magnetic field, the magnitude of force experienced depends upon the charge, velocity, and strength of the magnetic field. Fleming’s left-hand rule gives the direction of the magnetic force.

(v) In Fleming’s left-hand rule, the thumb’s direction shows the:

• current

   

• field

   

• motion

   

• charge

   

Q 20 :

Read the passage given below and answer the following questions from (i) to (v).

The space surrounding a magnet in which magnetic force is exerted, is called a magnetic field. The direction of magnetic field lines at a place can be determined by using a compass needle. A compass needle placed near a magnet gets deflected due to the magnetic force exerted by the magnet.

The north end of the needle of the compass indicates the direction of magnetic field at the point where it is placed. When the magnet shown in the diagram below is moving towards the coil, the galvanometer gives a reading to the right.

(i) The direction of induced current is given by:

• Right hand thumb rule

   

• Fleming’s right hand rule

   

• Fleming’s left hand rule

   

• Maxwell’s rule

   

Q 21 :

Read the passage given below and answer the following questions from (i) to (v).

The space surrounding a magnet in which magnetic force is exerted, is called a magnetic field. The direction of magnetic field lines at a place can be determined by using a compass needle. A compass needle placed near a magnet gets deflected due to the magnetic force exerted by the magnet.

The north end of the needle of the compass indicates the direction of magnetic field at the point where it is placed. When the magnet shown in the diagram below is moving towards the coil, the galvanometer gives a reading to the right.

(ii) What is the condition of electromagnetic induction?

• There must be a relative motion between the coil of wire and galvanometer.

   

• There must be a relative motion between the galvanometer and a magnet.

   

• There must be a relative motion between the galvanometer and generator.

   

• There must be a relative motion between the coil of wire and a magnet.

   

Q 22 :

Read the passage given below and answer the following questions from (i) to (v).

The space surrounding a magnet in which magnetic force is exerted, is called a magnetic field. The direction of magnetic field lines at a place can be determined by using a compass needle. A compass needle placed near a magnet gets deflected due to the magnetic force exerted by the magnet.

The north end of the needle of the compass indicates the direction of magnetic field at the point where it is placed. When the magnet shown in the diagram below is moving towards the coil, the galvanometer gives a reading to the right.

(iii) A student writes a few statements after studying the principles of electromagnetism and working of electric motor:

(I) Fleming’s left hand rule is used to make electromagnet.
(II) Fleming’s left hand rule is used in electric motor.
(III) Fleming’s right hand rule is used in electric motor.
(IV) Right hand thumb rule is used in electric motor.

Choose the correct statement(s) from the following:

• Only (I)

   

• Only (II)

   

• (I) and (III)

   

• (II), (III) and (IV)

   

Q 23 :

Read the passage given below and answer the following questions from (i) to (v).

The space surrounding a magnet in which magnetic force is exerted, is called a magnetic field. The direction of magnetic field lines at a place can be determined by using a compass needle. A compass needle placed near a magnet gets deflected due to the magnetic force exerted by the magnet.

The north end of the needle of the compass indicates the direction of magnetic field at the point where it is placed. When the magnet shown in the diagram below is moving towards the coil, the galvanometer gives a reading to the right.

(iv) When the magnet is moved away from the coil, it is observed that:

• the galvanometer needle deflects to the left

   

• the galvanometer needle deflects to the right.

   

• the galvanometer needle first deflects to the left and then to the right.

   

• the galvanometer needle first deflects to the right and then to the left

   

Q 24 :

Read the passage given below and answer the following questions from (i) to (v).

The space surrounding a magnet in which magnetic force is exerted, is called a magnetic field. The direction of magnetic field lines at a place can be determined by using a compass needle. A compass needle placed near a magnet gets deflected due to the magnetic force exerted by the magnet.

The north end of the needle of the compass indicates the direction of magnetic field at the point where it is placed. When the magnet shown in the diagram below is moving towards the coil, the galvanometer gives a reading to the right.

(v) The induced current is highest when:

• direction of magnetic field is parallel to the direction of motion of coil.

   

• direction of magnetic field is opposite to the direction of motion of coil.

   

• direction of magnetic field is perpendicular to the direction of motion of coil.

   

• direction of magnetic field is in straight line to the direction of motion of coil.

   

Q 25 :

Read the passage given below and answer the following questions from (i) to (v).

The magnetic field lines of an infinite wire are circular and centered at the wire and they are identical in every plane perpendicular to the wire as shown in the figure.

Since the field decreases with distance from the wire, the spacing of the field lines must increase correspondingly with distance. The direction of this magnetic field may be found with a second form of the right-hand rule. If you hold the wire with your right hand so that your thumb points along the current, then your fingers wrap around the wire in the same sense as B.

 

(i) A vertical wire carries an electric current out of the page. What is the direction of the magnetic field at point P located to the west from the wire?

• North

   

• South

   

• East

   

• Down

   

Q 26 :

Read the passage given below and answer the following questions from (i) to (v).

The magnetic field lines of an infinite wire are circular and centered at the wire and they are identical in every plane perpendicular to the wire as shown in the figure.

Since the field decreases with distance from the wire, the spacing of the field lines must increase correspondingly with distance. The direction of this magnetic field may be found with a second form of the right-hand rule. If you hold the wire with your right hand so that your thumb points along the current, then your fingers wrap around the wire in the same sense as B.

 

(ii) A student writes the following statements on the characteristics of magnetic field lines:

(I) The magnetic field lines are imaginary lines.
(II) The magnetic field lines have only magnitude.
(III) The magnetic field lines are closed curves.
(IV) The magnetic field lines emerge from the south pole of a magnet.

Choose the correct statement(s) from the following:

• Only (I)

   

• Both (I) and (II)

   

• Both (I) and (III)

   

• Both (II) and (IV)

   

Q 27 :

Read the passage given below and answer the following questions from (i) to (v).

The magnetic field lines of an infinite wire are circular and centered at the wire and they are identical in every plane perpendicular to the wire as shown in the figure.

Since the field decreases with distance from the wire, the spacing of the field lines must increase correspondingly with distance. The direction of this magnetic field may be found with a second form of the right-hand rule. If you hold the wire with your right hand so that your thumb points along the current, then your fingers wrap around the wire in the same sense as B.

 

(iii) A current carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:

• from top to bottom

   

• from left to right

   

• from bottom to top

   

• from right to left

   

Q 28 :

Read the passage given below and answer the following questions from (i) to (v).

The magnetic field lines of an infinite wire are circular and centered at the wire and they are identical in every plane perpendicular to the wire as shown in the figure.

Since the field decreases with distance from the wire, the spacing of the field lines must increase correspondingly with distance. The direction of this magnetic field may be found with a second form of the right-hand rule. If you hold the wire with your right hand so that your thumb points along the current, then your fingers wrap around the wire in the same sense as B.

 

(iv) A student plotted the variation of magnetic field around a straight current carrying wire and the distance from the wire where the magnetic field is measured. Study the graph below and answer the question that follows:

The magnetic field around a current carrying straight wire:

• increases linearly with increase in distance.

   

• decreases with increase in distance.

   

• remains constant.

   

• magnetic field at a point does not depend on distance.

   

Q 29 :

Read the passage given below and answer the following questions from (i) to (v).

The magnetic field lines of an infinite wire are circular and centered at the wire and they are identical in every plane perpendicular to the wire as shown in the figure.

Since the field decreases with distance from the wire, the spacing of the field lines must increase correspondingly with distance. The direction of this magnetic field may be found with a second form of the right-hand rule. If you hold the wire with your right hand so that your thumb points along the current, then your fingers wrap around the wire in the same sense as B.

 

(v) A positive charge is moving towards a person. The direction of magnetic field lines will be in:

• clockwise direction

   

• anticlockwise direction

   

• vertically upward direction

   

• vertically downward direction