First slide

Inductance

Question

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___

Easy

Solution

$\begin{array}{l} I n d u c e d e m f = ε = L |\frac{d i}{d t}| \\ \Rightarrow L = \frac{ε}{|\frac{d i}{d t}|} = \frac{100}{\frac{(0.25 - 0)}{0.025 \times 10^{- 3}}} \\ \Rightarrow L = 10 m H \end{array}$

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