First slide

Inductance

Question

When the current in a coil changes from 8 ampere to 2 ampere in $3 \times 10^{- 2}$ second, the e.m.f. induced in the coil is $2 volt$ . The self inductance of the coil (in millihenry) is

Moderate

A

1
B

5
C

20
D

10

Solution

$e = - L \frac{di}{dt} \Rightarrow 2 = - L (\frac{8 - 2}{3 \times 10^{- 2}}) \Rightarrow L = 0 .01 H = 10 mH$

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