A Primary coil and secondary coil are are placed close to each other . A current changes at the rate of 25 A in a millisecond ,is present in the primary coil .If the mutual inductances is `92xx10^(-6)Hz`H, then the value of induced emf in the secondary coil is

Options

A. 4.6V
B. 2.3V
C. 0.38mV
D. 0.23mV

Answer

B

Explanation

Induced emf in the secondary coil,
`e=M(di)/(dt)=92xx10^(-6)(25)/(10^(-3))=2.3V`