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When the cument changes form +200 \mathrm{~A} to -200 \mathrm{~A} in 10 seconds, an emf of 32 \mathrm{~V} is indueed is a coil. The coeff of self-induction of the coil is (approx).

Option: 1

0.6H


Option: 2

2H


Option: 3

0.8H


Option: 4

3H


Answers (1)

\rightarrow  if e is the induced e.m.f. in the coil,

     then e=-L \frac{d i}{d t}

So L =-\frac{e}{di / dt} \\

=\frac{-32}{\frac{-400}{10}}=\frac{-320}{-400}=0.8 \mathrm{H}

Posted by

Ramraj Saini

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