A circular current loop is placed in an external magnetic field. How is the torque related to the radius of the loop?
A) directly proportional to radius squared
B) directly proportional to radius
C) inversely proportional to radius squared
D) inversely proportional to radius

Question

Quizplus · Accepted Answer

The torque on a current loop in a magnetic field is given by τ = nIABsinθ, where A is the area of the loop. For a circular loop, A = πr², so the torque is directly proportional to the radius squared.

A Circular Current Loop Is Placed in an External Magnetic