A rectangular coil of `20` turns and area of cross-section `25 cm^(2)` has a resistance of `100 ohm`. If a magnetic field which is perpendicular to the plane of the coil changes at the rate of `1000` tesla per second, the current in the coil is

Options

A. 1.0 ampere
B. 50 ampere
C. 0.5 ampere
D. 5.0 ampere

Answer

C

Explanation

`(dB)/dt=1000T//sec`
`|e|=N(dvarphi)/dt=NA(dB)/dt=20xx25xx10^(-4)xx1000=50`
`I=e/R=50/100=0.5A`.