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 $0.30 \times 10^{-4}\;wb/m^2$. Which end of the wire is at the higher electrical potential ?

Question

(a) East end
(b) West end
(c) north end
(d) none of these