A metallic disc of radius rotates about its central axis with a constant frequency of…

PHYSICS · Single correct · CBSE · Physics · Electromagnetic Induction · Electromagnetic Induction

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}

(b)

0.31\,\text{V}

(c)

0.63\,\text{V}

(d)

1.26\,\text{V}