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Q.

A coil with self inductance of 2.4H and resistance 12Ω is suddenly switched across a 120V direct current supply of negligible internal resistance.
Determine (i) the time constant of the coil and
(ii) the final steady current

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a

3 sec, 20A

b

0.2 sec, 10A

c

2 sec, 10A

d

4 sec, 20A

answer is A.

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Detailed Solution

final steady current $i = \frac{E_{0}}{R} = \frac{120}{12} = 10$
$t = \frac{L}{R} = \frac{2 .4}{12} = 0 .2 \sec$

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