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  4. In a fluorescent lamp choke (a small transformer) 100 V of reverse voltage is produced when the choke current changes uniformly from 0.25 A to 0 in a duration of 0.025 ms. The self-inductance of the choke (in mH) is estimated to be. Given 10

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Q. In a fluorescent lamp choke (a small transformer) 100 V of reverse voltage is produced when the choke current changes uniformly from 0.25 A to 0 in a duration of 0.025 ms. The self-inductance of the choke (in mH) is estimated to be__________.
Given 10

JEE MainJEE Main 2020Electromagnetic Induction

Solution:

$V=\left|L \frac{di}{dt}\right|$
$\Rightarrow L=\frac{V}{\left|\frac{di}{dt}\right|}=\frac{100}{\frac{0.25}{0.025\times10^{-3}}}=10mH$