Q. 57

# A circular loop carrying a current i has wire of total length L. A uniform magnetic field B exists parallel to the plane of the loop.(a) Find the torque on the loop.(b) If the same length of the wire is used to form a square loop, what would be the torque? Which is larger?

Given-
Magnetic field intensity = B

Magnitude of current = i

Circumference, ,

where

r is the radius of the coil

So, area of the coil, Torque acting on the coil, Where

B= applied magnetic field

A= area of rectangular loop

I = current flowing through coil = angle between the area vector and magnetic field  (b) Let s be the length of the square loop.

Then given in the question that     So, the torque in case of the circular loop is larger.

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