Question

A superconducting loop of radius R has self inductance L. A uniform and constant magnetic field B is applied perpendicular to the plane of the loop. Initially current in this loop is zero. The loop is rotated by 180⁰. The current in the loop after rotation is equal to –

• A. Zero
• B.
• C.
• D.

Answer 1

Answer: (C)

Answer 2

Flux cannot change in a superconduction loop.

Df = 2pR² .B

Initially current was zero, so self flux was zero.

\ Finally Li = 2pR² × B.

i =