When current in a coil changes with time, how is the back e.m.f. induced in the coil related to it ?
Video Solution
Text Solution
Back e.m.f. induced in the coil. e=−LdIdt
Where L is coefficient of self-inductance of the coil and dI/dt is the rate of change of current through the coil.
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Updated on:21/07/2023
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Knowledge Check
- Question 1 - Select One
Whenever current in a coil is changed, an e.m.f. is induced in the same coil. This property of coil is due to ___________.
Aeddy currentsBmutual inductionCself inductionDhysteresis - Question 1 - Select One
When current in a coil changes to 2 ampere from 8 ampere in 3×10−3, the e.m.f. induced in the coil is 2 volt. The self-inductance of the coil in millihenry is
A1B5C20D10 - Question 1 - Select One
When the current in a coil changes from 2A to 4A in 0.05 sec, the e.m.f. developed in the coil is 8V. The coefficent of self induction of the coil is
A0.1 HB0.2 HC0.4 HD0.3 H - Question 1 - Select One
The current in a coil decreases from 5 A to 0 in 0.1 sec. If the average e.m.f induced in the coil is 50 V, then the self inductance of the coil is
A0.25 HB0.5 HC1 HD2 H - Question 1 - Select One
A varying current in a coil change from 10A to 0A in 0.5sec. If the average emf induced in the coil is 220V, the self inductance of the coil is
A5HB6HC11HD12H - Question 1 - Select One
The current in a coil changes from 4 ampere to zero in 0.1s. If the average e.m.f. induced is 100vo<, what is the self-inductance of the coil?
A2.5HB25HC400HD40H
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