A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rpm, in a plane normal to earth's magnetic field at the place. If the megnitude of the field is 0.40 gauss, what is the induced e.m.f. between the axle and rim of the wheel.

Options

A. `1.256xx10^(-3)V`
B. `6.25xx10^(-4)V`
C. `1.256xx10^(-4)V`
D. `6.28xx10^(-5)V`

Answer

D

Explanation

`e=Bl^(2)piv=0.4xx10^(-4)xx(0.5)^(2)xx(3.14)xx(120)/(60)`
`=6.28xx10-5V`