Electro Magnetic Induction And Alternating Currents Question 561

Question: A varying current in a coil changes from 10 amp to zero in 0.5 sec. If average EMF is induced in the coil is 220 volts, the self-inductance of coil is [EAMCET 1994; MH CET (Med.) 1999]

Options:

A) 5 H

B) 10 H

C) 11 H

D) 12 H

Show Answer

Answer:

Correct Answer: C

Solution:

$ |e|,=L\frac{di}{dt}\Rightarrow 220=L\times \frac{10}{0.5} $
$ \Rightarrow L=11\ H $



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