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Solution


Q.

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:
1 increases linearly with increase in distance.  
2 decreases with increase in distance.  
3 remains constant.  
4 magnetic field at a point does not depend on distance.  

Ans.

(2)