A square coil of turns

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A square coil of

50

turns, side

20\,\text{cm}

, is placed in a uniform magnetic field of

0.25\,\text{T}

normal to its plane. Each side of the square is uniformly reduced at the rate of

2\,\text{mm}\,\text{s}^{-1}

. If the resistance of the coil is

5\,\Omega

, determine the magnitude of the induced current.