Question 180: Electromagnetic Induction

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 ________.

Accepted Answer

V = $$\left| {L{{di} \over {dt}}} ight|$$
$$ \Rightarrow $$ L = $${V \over {\left| {{{di} \over {dt}}} ight|}}$$ = $${{100} \over {{{0.25} \over {0.025 	imes {{10}^{ - 3}}}}}}$$ = 10 mH

Electromagnetic Induction

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 ________.

Integer / Numeric Answer Type