An magnetic field of lux density 10 T acts normal to a coil of 50 turns having `100 cm^(2)` area. If coil is removed from magnetic field in `0.1` is emf induced is

Options

A. 10 V
B. 50 V
C. zero
D. 100 V

Answer

B

Explanation

Given,
`n=50, A=100 cm^(2)=10^(-2) m^(2)`
`B=10 T and dt =0.1` s
Initial flux `phi= nBa=50xx10xx10^(-2)`
`=5Wb`
On being removed the coil from magnetic field `phi_(2)=0`
`d phi=0 -5 =-5 Wb`
`:.` induced emf `=-(d phi)/(dt)=-((-5)/(0.1))`
`=50 V`