The spokes of a wheel are made of metal and their lengths are of one metre. On rotating the wheel about its own axis in a uniform magnetic field of `5xx10^(-5)` tesla normal to the plane of the wheel, a potential difference of `3.14 mV` is generated between the rim and the axis. The rotational velocity of the wheel is-

Options

A. `63 rev.//s`
B. `50 rev.//s`
C. `31.4 rev.//s`
D. `20 rev. //s`

Answer

d