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An average induced e.m.f of 2V appers in...

An average induced e.m.f of 2V appers in a coil when the current in it is changed from 10 A in opposite direction in 0.5 sec. The self inductance of the coil is

A

50 mH

B

60 mH

C

30 mH

D

25 mH

Text Solution

Verified by Experts

The correct Answer is:
A
`e = L(dI)/(dt) = L((20)/(0.5))=40L`
`:. L = 2/40 = 1/20 = 0.05 H = 50 mH`.
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MARVEL PUBLICATION-ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS -TEST YOUR GRASP - 16
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