First slide

Inductance

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

Moderate

A

12.5 V
B

64.0 V
C

0.016 V
D

100.0 V

Solution

$e = M \frac{di}{dt} = 1 .25 \times 80 = 100 V$

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