A boat is moving due east in a region where the earth's magnetic field is $5.0 \times 10^{-5} NA^{-1}m^{-1}$ due north and horiontal. The boat carries a vertical aerial 2m long. If the speed of the boat is $1.50 \;ms^{-1}$, the magnitude of the induced emf in the wire of aerial is :

Question

( A ) 0.75 mV
( B ) 0.50 mV
( C ) 0.15 mV
( D ) 1 mV