Electro Magnetic Induction And Alternating Currents Question 548

Question: When current in a coil changes to 2 ampere from 8 ampere in $ 3\times {{10}^{-3}},\sec ond $ , the e.m.f. induced in the coil is 2 volt. The self inductance of the coil in millihenry is [MP PET 1995]

Options:

A) 1

B) 5

C) 20

D) 10

Show Answer

Answer:

Correct Answer: A

Solution:

$ e=L\frac{di}{dt} $

Þ $ 2=L\times \frac{6}{3\times {{10}^{-3}}}\Rightarrow L=1\ mH $



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