A rectangular coil of 100 turns and size `0.1mxx0.05m` is placed perpendicular to a magnetic field of 0.1 T. If the field drops to 0.05 T in 0.05 s, the magnitude of the emf induced in the coil is

Options

A. 0.5 V
B. 1.0 V
C. 1.5 V
D. 2.0 V

Answer

A

Explanation

`e=(d phi)/(dt)=(d)/(dt)(NBA)=NA(dB)/(dt)`
`=100xx0.1xx0.05xx((0.1-0.05)/(0.05))=0.5 V`