A magnetic field `2xx 10^(-2) T` acts at right angles to a coil of area `200 cm^2` with 25 turns. The average emf induced in the coil is 0.1 v when it removes from the field in time t. The value of t is
Options:
(a) 0.1 sec
(b) 1 sec
(c) 0.01 sec
(d) 20 sec