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Q.

A rectangular loop carrying a current i1, is situated near a long straight wire carrying a steady current i2. The wire is parallel to one of the sides of the loop and is in the plane of the loop as shown in the figure. Then the current loop will

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a

move away from the wire

b

move towards the wire

c

rotate about an axis parallel to the wire

d

remain stationary

answer is B.

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Detailed Solution

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Force on the edges parallel to the straight wire will be attractive if currents are parallel and repulsive if currents are antiparallel. Force on the edges perpendicular to the straight wire will be zero.

The side which is closer to the wire will experience larger force than the side which is away. 

So, net force on the loop will be attractive. 

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