A square loop of side 2a, and carrying | EMI

JEE MAIN 2020

05-09-2020 S1

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 the z-axis and passing through the point (0, b, 0), (b > > a). The magnitude of the torque on the loop about z-axis is given by

Select the correct option:

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

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

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

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

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution