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Inductors in Circuits

The current i...

Question

The current in a choke changes from 0 to 10 A in 5 seconds. If the inductance of the choke is 2 H the induced emf is

A

2 V

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B

8 V

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C

4 V

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D

12 V

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Solution

The correct option is C 4 V
$Δ I = (10 - 0) = 10 A$
$Δ t = 5 s; L = 2 H$
$L = \frac{- e}{\frac{d I}{d t}}$
$∴ e = L \frac{d I}{d t} = 2 \times \frac{10}{5} = 4 V$

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