First slide

Inductance

Question

An average induced e.m.f. of 1V appears in a coil when the current in it is changed from 10A in one direction to 10 A in opposite direction in 0.5 sec. Self-inductance of the coil is

Moderate

A

25 mH
B

50 mH
C

75 mH
D

100 mH

Solution

$| e | = L \frac{di}{dt} \Rightarrow 1 = \frac{L \times \{10 - (- 10)\}}{0 .5} \Rightarrow L = 25 mH$

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