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Byju's Answer
Standard XII
Physics
Secondary Winding
An average em...
Question
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 value in the opposite direction in 0.1 s. Find the self-inductance of the inductor.
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Solution
Let the self-inductance of the inductor be L.
Average emf induced in the inductor, V = 20 V
Change in current, di = i
2
− i
1
= 2.5 − (−2.5) = 5 A
Time taken for the change, dt = 0.1 s
The voltage induced in the inductor is given by
V
=
L
d
i
d
t
⇒
20
=
L
5
0
.
1
⇒
20
=
L
×
50
⇒
L
=
20
50
=
4
10
=
0
.
4
H
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