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Question

A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to one of the sides of the loop and is in the plane of the loop. If a steady current I is established in the wire as shown in the figure, the loop will:
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A
rotate about an axis parallel to the wire
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B
move away from the wire
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C
remain stationary
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D
move towards the wire
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Solution

The correct option is D move towards the wire
A rectangular loop carrying a current i is situated near a long straight wire such that the wire is parallel to one of the sides of the loop and is in the plane of the loop. If a steady current I is established in the wire as shown in the figure, the loop will Let the side of the loop nearer the straight wire is attracted towards the straight wire with a force F1 and the opposite side repelled by the straight wire with a force F2.Since the current in the side of the loop nearer to the wire is in the same direction as the straight wire, we get $$F_1>F_2$$. Hence, the loop moves towards the wire.

Physics

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