A circular loop of radius is placed with its plane perpendicular to a uniform…

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

Problem

A circular loop of radius

5.0\,\text{cm}

is placed with its plane perpendicular to a uniform magnetic field of magnitude

0.40\,\text{T}

. The loop is pulled so that its radius increases uniformly at the rate

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

. Calculate the magnitude of the induced emf at the instant when the radius is

5.0\,\text{cm}