Electro Magnetic Induction And Alternating Currents Question 532

Question: When the current in a coil changes from 8 ampere to 2 ampere in $ 3\times {{10}^{-2}} $ second, the e.m.f. induced in the coil is $ 2\ volt $ . The self-inductance of the coil (in millihenry) is [MNR 1991; UP SEAT 2000; Pb PET 2004]

Options:

A) 1

B) 5

C) 20

D) 10

Show Answer

Answer:

Correct Answer: D

Solution:

$ e=-L\frac{di}{dt}\Rightarrow 2=-L( \frac{8-2}{3\times {{10}^{-2}}} ) $
$ \Rightarrow L=0.01\ H=10\ mH $



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