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When current in a coil changes with time...

When current in a coil changes with time, how is the back e.m.f. induced in the coil related to it ?

Text Solution

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Back e.m.f. induced in the coil. `e = - L(dI)/(dt)`
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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Knowledge Check

  • Whenever current in a coil is changed, an e.m.f. is induced in the same coil. This property of coil is due to ___________.

    A
    eddy currents
    B
    mutual induction
    C
    self induction
    D
    hysteresis

  • When current in a coil changes to 2 ampere from 8 ampere in 3xx10^(-3) , the e.m.f. induced in the coil is 2 volt. The self-inductance of the coil in millihenry is

    A
    `1`
    B
    `5`
    C
    `20`
    D
    `10`

  • 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

    A
    0.1 H
    B
    0.2 H
    C
    0.4 H
    D
    0.3 H

    • Similar Questions

    Explore conceptually related problems

    The mutual inductance between two coils is 2.5 H. If the current in one coil is changed at the rate of 1 As^(-1), what will be the emf induced in the other coil?

    At which position of the plane of the rotating coil with the direction of magnetic field the e.m.f induced in the coil is maximum ?

    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

    A varying current in a coil change from 10A to 0A in 0.5 sec . If the average emf induced in the coil is 220V , the self inductance of the coil is

    The current in a coil changes from 4 ampere to zero in 0.1s . If the average e.m.f. induced is 100 volt , what is the self-inductance of the coil?

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