The radius of a coil decreases steadily at the rate of `10^(–2)` m/s. A constant and uniform magnetic field of induction `10^(–3) Wb'/'m^2` acts perpendicular to the plane of the coil. The radius of the coil when the induced e.m.f. in the coil is `1muV`, is :-
Options:
(a) `2/pi cm`
(b) `3/pi cm`
(c) `4/pi cm`
(d) `5/pi cm`