First slide

Inductance

Question

When current in a coil changes to 2 ampere from 8 ampere in $3 \times 10^{- 3} second$ , 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

$e = L \frac{di}{dt} \Rightarrow 2 = L \times \frac{8 - 2}{3 \times 10^{- 3}} \Rightarrow L = 1 mH$

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