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An average emf of 20 V is induced in a...

An average emf of 20 V is induced in an inductor when the current in it is changed from `2.5 A` in one direction to the same valute in the opposite direction in 0.1 s. Find the self inductance of the inductor.

Text Solution

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Here `Delta I=I_2-I_1=2.5 -(-2.5)=5.0A`
`Deltat=0.1 ` second
Average emf `=L(DeltaI)/(Deltat)`
`rArr L=(e_("avg").Deltat)/(DeltaI)=(20 "volt"xx0.1 sec)/(5.0A) =0.4 ` Henry
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