Question

A square with side length b

flow ring around the z-axis freely

It is attached to be rotatable. 2amper

+ X to this ring carrying ampere current

with an intensity of B0

area has been applied. To the edges of the ring

applied forces and

Calculate the torque it will create.

Answer 1

As we know, the torque is

$$τ=NIAB\sinθ=1·2·b^2·B_0\sin90°=2b^2B_0.$$