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An inductor coil stores 32 J of magnetic...

An inductor coil stores 32 J of magnetic field energy and dissiopates energy as heat at the rate of 320 W when a current of 4 A is passed through it. Find the time constant of the circuit when this coil is joined across on ideal battery.

Text Solution

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The correct Answer is:
`0.2 s`
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An induction coil stores 32 J of magnetic energy and dissipates energy as heat at the rate of 320 W. A current of 4 A is passed through it. Find the time constant (in second) of the circuit when the coil is joined across a battery.

An inductor coil stores 16 joules of energy and dissipates energy as heat at the rate of 320 W when a current of 2 Amp is passed through it. When the coil is joined across a battery of emf 20V and internal resistance 20Omega the time constant for the circuit is tau . Find 100tau ( in seconds).

Knowledge Check

  • An inductor coil stores U energy when i current is passed through it and dissipates energy at the rate of P. The time constant of the circuit, when this coil is connected across a battery of zero internal resistance is

    A
    `(4U)/P`
    B
    `U/P`
    C
    `(2U)/P`
    D
    `(2P)/U`

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