The mutual inductance of a pair of coils, each of N turns, is M henry. If a current of I ampere in one of the coils is brought to zero in t second, the emf induced per turn in the other coil, in volt, will be

Options

A. `(MI)/(t)`
B. `(NMI)/(t)`
C. `(MN)/(It)`
D. `(MI)/(Nt)`

Answer

A

Explanation

`E=(d)/(dt)(NMI)rArr E=NM(dI)/(dt)rArr E=(NMI)/(t)`
emf induced per unit turn `=(E )/(N)=(MI)/(t)`