Question

A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B such that B is parallel to the plane of the loop. The magnetic torque acting on the loop is-

• A. irB
• B. 2priB
• C. Zero
• D. pr²iB

Answer 1

Answer: (D)

pr²iB

Answer 2

t=NIABsinq = (1)(I)(pr²)Bsin90⁰ = pr²IB