Electro Magnetic Induction And Alternating Currents Question 191

Question: Time constant of L-R circuit will be

Options:

A) $ \frac{L}{R} $

B) $ \frac{2L}{R} $

C) $ \frac{L}{2R} $

D) None of these

Show Answer

Answer:

Correct Answer: C

Solution:

  • A circuit equivalent to the given circuit can be drawn as follows:

Where $ R_{eq}=R+\frac{2R\times 2R}{4R} $

$ =R+R $ $ R_{eq}=2R $
$ \therefore $ Time constant $ =\frac{L}{2R} $



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