Physics

Problem

A metallic disc of radius

0.20\,\text{m}

rotates about its central axis with a constant frequency of

5\,\text{rev s}^{-1}

in a uniform magnetic field of

0.50\,\text{T}

directed perpendicular to the plane of the disc. The emf developed between the centre and the rim of the disc is approximately a)

0.16\,\text{V}

0.31\,\text{V}

0.63\,\text{V}

1.26\,\text{V}