A player with 3 meter long iron rod runs toward east with a speed of `30km//hr` . Horizontal component of eath's magnetic field is `4xx10^(-5)Wb//m^(2)` . If he runs with the rod in horizontal and vertical position, then the potential difference induced between the two ends of the rod in the two cases will be

Options

A. 1 mV is both cases
B. zero in both cases
C. zero in horizontal position and, 1 mV in vertical position
D. zero in vertical position and, 1 mV in horizontal position

Answer

C

Explanation

`e = B_(H)lv = 4 xx 10^(-5) xx 3 xx 30 xx 5/18 = 10^(-3) V = 1 mV`.