A wheel with 10 metallic spokes each 0.5m long is rotated with a speed of 120 `"rev"//"min"` in a plane normal to the earth.s magnetic field at the place. If the magnitude of the field is 0.4 G, the induced e.m.f. between the axle and the rim of the wheel equal to

Options

A. `1.256 xx 10^(-3)` V
B. `6.28 xx 10^(-4)` V
C. `1.256 xx 10^(-4)` V
D. `6.28 xx 10^(-5)` V

Answer

D