A loop of area `1m^2` is placed in a magnetic field `B=2T`, such that plane of the loop is parallel to the magnetic field. If the loop is rotated by `180^@`, the amount of net charge passing through any point of loop, it its resistance is `10Omega` is

Options

A. `0.4C`
B. `0.2C`
C. `0.8C`
D. `0 C`

Answer

A

Explanation

`phi_i=BScos0^@=2Wb`
`phi_f=BS cos 180^@=-2Wb`
`|/_\phi|=4Wb`
`|/_\q|=(|/_\phi|)/R`
`=4/10=0.4C`