A rectangular coil rotates about an axis normal to the magnetic field, If `E_(m)` is the maximum value of the induced emf, then the instantaneous emf when plane of the coil makes an angle of `45^(@)` with the magnetic field is

Options

A. `(1)/(2)E_(m)`
B. `(1)/(4)E_(m)`
C. `(1)/(sqrt2)E_(m)`
D. `E_(m)`

Answer

C

Explanation

`E=E_(m)cos45^(@)`,
where, `E_(m)` is the maximum value of induced emf.
`therefore" "E=(E_(2))/(sqrt2)`