A square loop of side and carrying current ...........| EMF

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JEE MAIN 2020

06-09-2020 S2

Question

A square loop of side 2a and carrying current I is kept in xz plane with its centre at origin. A long wire carrying the same current I is placed parallel to z-axis and passing through point (0, b, 0), (b >> a). The magnitude of torque on the loop about z-axis will be

Select the correct option:

A

$\frac{\mu_0 l^2 a^2}{2 \pi b}$

B

$\frac{2 \mu_0 l^2 a^2 b}{\pi\left(a^2+b^2\right)}$

C

$\frac{\mu_0 l^2 a^2 b}{2 \pi\left(a^2+b^2\right)}$

D

$\frac{2 \mu_0 l^2 a^2}{\pi b}$

✓ Correct! Well done.

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