Q.

A square loop ABCD, carrying a current  i, is placed near and coplanar with a long straight conductor XY carrying a current I.

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a

There is no net force on the loop.

b

The loop will be attracted  by the conductor.

c

The loop will be repelled  by the conductor.

d

The loop will rotate about the conductor.

answer is B.

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Detailed Solution

If the current is clock wise the near side of square and straight conductor are carrying like currents, hence loop is attracted towards wire

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A square loop ABCD, carrying a current  i, is placed near and coplanar with a long straight conductor XY carrying a current I.