Q.

A current carrying square loop is placed new a straight infinietely long current carrying wire as shown in the figure. The torque acting on the loop is
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a

μ02πi1i2lab

b

μ02πi1i2laa+b

c

0

d

μ02πi1i2lbaab

answer is D.

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Detailed Solution

The forces acting on the sides of the square due to current I, all lie in the planes of the coil. There fore, there is no net torque.

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A current carrying square loop is placed new a straight infinietely long current carrying wire as shown in the figure. The torque acting on the loop is