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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. If a steady current I is established in the wire, as shown in Fig., the loop



A

rotate about an axis parallel to the wire

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B

move away from the wire

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C

move towards the wire

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D

remain stationary.

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Solution

The correct option is B

move towards the wire


Referring to Fig. the forces acting on arms BC and AD are equal and opposite. The force on arm AB is given by
F1=μ0 I i2πa
which is directed towards the wire. The force on arm CD is given by
F2=μ0 I i2π(a+b)
which is directed away from the wire. Since F1>F2, the loop; will move towards the wire. Hence the correct choice is (c).


Physics

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