First slide

Inductance

Question

If a current of 3 amperes flowing in the primary coil is reduced to zero in 0.001 second, then the induced e.m.f. in the secondary coil is 15000 volts. The mutual inductance between the two coils is

Easy

A

0.5 H
B

5 H
C

1.5 H
D

10 H

Solution

$e = M \frac{di}{dt} or 15000 = M (\frac{3}{0 \cdot 001}) ∴ M = \frac{15000 \times 0 \cdot 001}{3} = 5 H$

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