Question

The mutual inductance between two coils is 1.25 henry. If the current in the primary changes at the rate of 80 ampere/second, then the induced e.m.f. in the secondary is(a) 12.5 V(b) 64.0 V(c) 0.016 V(d) 100.0 V

Answer 1

Correct Answer : option d: 100.0 V

Explanation :

Current changes =di/dt= 80 A/seconds

Mutual Inductance = 1.25henry

e=M di/dt

=1.25x 80

=125x80/100

=100 V

Answer 2

Given,

Current = 80Amp/Sec

Mutual Inductance = 1.25Hz

e = M di/dt

1.25×80

125×80×100

100V.