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  4. In a fluorescent lamp choke 100 V of reverse voltage is produced when the choke current changes uniform 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

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Q. In a fluorescent lamp choke $100\,V$ of reverse voltage is produced when the choke current changes uniform 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

NTA AbhyasNTA Abhyas 2022

Solution:

$100=\frac{L(0.25)}{0.025} \times 10^{3} $
$ \therefore L=100 \times 10^{-4} H$
$=10 \,mH$