A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is:
towards south
towards east
downward
upward
(4)
A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is upward. This can be explained by Fleming’s Left-hand Rule which states that if we stretch our thumb, forefinger and middle finger of our left hand perpendicular to each other in such a way that forefinger points the direction of magnetic field and middle finger points the direction of current then thumb will represent the direction of motion or the force acting on the conductor. Hence, upward is the correct answer.
The phenomenon of electromagnetic induction is:
the process of charging a body.
the process of generating magnetic field due to a current passing through a coil.
producing induced current in a coil due to relative motion between a magnet and the coil.
the process of rotating a coil of an electric motor.
(3)
The phenomenon of electromagnetic induction is producing induced current in a coil due to relative motion between a magnet and the coil. When a coil is brought near the magnet, and a relative motion is generated between the two by either moving the magnet or the coil, the magnetic flux links through the coil changes. This change in the magnetic flux produces an emf or voltage and hence, subsequent electric current in the coil.
The direction of force acting on a current carrying conductor placed in a magnetic field can be obtained by:
Fleming’s left hand rule.
Fleming’s right hand rule.
Clock face rule.
Ampere’s swimming rule.
(1)
The direction of force acting on a current carrying conductor placed in a magnetic field can be obtained by Fleming’s left hand rule. According to this rule, when a current-carrying conductor is placed in an external magnetic field, the conductor experiences a force perpendicular to both the field and to the direction of the current flow.
The process shown in the diagram below is:
Electromagnetism
Electric generator
Electric Motor
Electric fuse
(1)
An electromagnet produces a magnetic field so long as current flows in its coil.
Which of the given options represents the correct pair?
Right-hand thumb rule – Direction of force
Galvanometer – Adjust current in circuit
Earth wire – Red colour
MRI – Magnetic Resonance Imaging
(4)
MRI is a technique used to obtain the image of different body parts by using magnetic field.
The strength of magnetic field inside a long current-carrying straight solenoid is:
More at the ends then at the center
Minimum in the middle
Same at all points
Found to increase from one end to the another
(3)
The magnetic field inside a solenoid is proportional to both the applied current and the number of turns per unit length. There is no dependence on the diameter of the solenoid, and the field strength does not depend on the position inside the solenoid, i.e., the field inside is constant.
The magnetic field is nearly uniform field in the center, i.e., inside of a long solenoid and the field outside is weak and divergent.
In the given electric circuit, the device X is:
Ammeter
Resistance
Galvanometer
Voltmeter
(3)
Galvanometer is an instrument that is used to detect the presence of the current in the circuit. And when magnet is moved near the coil, the current is induced in the coil.
The figure below shows the Fleming's left hand rule. Identify the correct label with the function?
Thumb – force
Fore finger – magnetic field
Middle finger – current
All of these
(4)
According to Fleming's left hand rule stretch the thumb, fore finger and middle finger of your left hand side that they are mutually perpendicular. If the first finger points in the direction of magnetic field and second finger in the direction of current, then thumb will point in the direction of force.
Mutual induction is a process in which current is induced in the neighbouring coil if current flows in a coil. In the figure shown below:
Maximum in situation (A)
Maximum in situation (B)
Maximum in situation (C)
Same in all situation
(1)
As both the coils are in the same plane. And induced current is found to be highest when the direction of the coil is at right angle to the magnetic field.
A charged particle enters at right angle into a uniform field as shown. What should be the nature of charge on the particle if it begins to move in a direction pointing vertically out of the page due to its interaction with the magnetic field?
Positive
Negative
Natural
Can't decide
(1)
Using Fleming's left hand rule, the nature of charged particle is positive.
