# A coil of circular cross - section having 1000 turns and $\;4\;cm^{2}\;$ face area is placed with its axis parallel to a magnetic field which decreases by $\;10^{-2}\;Wb\;m^{-2}\;$ in 0.01 s. The e.m.f induced in the coil is :

$(a)\;400\;mV \qquad(b)\;200\;mV \qquad(c)\;4\;mV \qquad(d)\;0.4\;mV$