One side of a rectangular conducting frame slides inward on smooth rails so that the…

PHYSICS · Single correct · GCSE · Physics · Magnetism and Electromagnetism · Magnetism and Electromagnetism

Problem

One side of a rectangular conducting frame slides inward on smooth rails so that the width of the loop decreases at a constant rate of

5.0\,\text{cm\,s}^{-1}

. The fixed height of the loop is

10\,\text{cm}

. A uniform magnetic field of

0.30\,\text{T}

is perpendicular to the plane of the loop. The magnitude of the emf induced in the loop is (a)

0.75\,\text{mV}

(b)

6.0\,\text{mV}

(c)

1.5\,\text{mV}

(d)

3.0\,\text{mV}