A horizontal straight wire $10 \;cm$ long expending from east to west is falling with a speed of $5.0\; m/s $ at right angles to the horizontal component of the earth's magnetic field $0.30 \times 10^{-4}\;wb/m^2$. What is the instantaneous value of the $emf$ induced in the wire ?

Question

$(a) \; 1.5 \times 10^3 V$
$(b) \; 1.5 \times 10^{-3} V$
$(c) \; 1.5 \times 10^2 V$
$(d) \; 1.5 \times 10^{-2} V$