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An inductor may store energy in...

An inductor may store energy in

A

its electric field

B

its coils

C

its magentic field

D

Both in electric and magnatic field

Text Solution

Verified by Experts

The correct Answer is:
c
CBSE AIPMT 1990
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In the steady state of the circuit shown in the figure the ratio of energy stored in the inductor to th energy stored in the capacitor is 10000.

Energy can be stored by an LC circuit oscillating at its natural frequency. Energy stored in a capacitor is in form of electric field between the plates. An inductor stores energy in form of magnetic field. If the inductor connected across capacitor, the voltage across the capacitor will drive the current through inductor, building up a magnetic field around it. The voltage across the capacitor falls to zero as the charge is used up by the current flow. Now the energy stored in the coil's magnetic field induces a voltage across the coil, because inductor opposes the current change. Thus energy required to charge the capacitor is extracted from the magnetic field. If we increase the value or L four times in LC oscillator, the frequency of oscillation is:

Knowledge Check

  • An inductor stores the energy in

    A
    1. its electric field
    B
    2. its coil
    C
    3. its magnetic field
    D
    4. both in electric and magnetic fields

  • Energy can be stored by an LC circuit oscillating at its natural frequency. Energy stored in a capacitor is in form of electric field between the plates. An inductor stores energy in form of magnetic field. If the inductor connected across capacitor, the voltage across the capacitor will drive the current through inductor, building up a magnetic field around it. The voltage across the capacitor falls to zero as the charge is used up by the current flow. Now the energy stored in the coil's magnetic field induces a voltage across the coil, because inductor opposes the current change. Thus energy required to charge the capacitor is extracted from the magnetic field. We cannot use LC oscillator:to, produce:

    A
    Very high frequencies
    B
    Very low.frequencies
    C
    High frequencies
    D
    Audio frequencies

  • Energy can be stored by an LC circuit oscillating at its natural frequency. Energy stored in a capacitor is in form of electric field between the plates. An inductor stores energy in form of magnetic field. If the inductor connected across capacitor, the voltage across the capacitor will drive the current through inductor, building up a magnetic field around it. The voltage across the capacitor falls to zero as the charge is used up by the current flow. Now the energy stored in the coil's magnetic field induces a voltage across the coil, because inductor opposes the current change. Thus energy required to charge the capacitor is extracted from the magnetic field. For LC oscillator, the frequency of oscillator is:

    A
    Proportional to square of Lor C
    B
    Independent of the value of Lor C
    C
    Directly proportional to the value of L or C
    D
    Inversely proportional te square foot of L or C

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    Energy can be stored by an LC circuit oscillating at its natural frequency. Energy stored in a capacitor is in form of electric field between the plates. An inductor stores energy in form of magnetic field. If the inductor connected across capacitor, the voltage across the capacitor will drive the current through inductor, building up a magnetic field around it. The voltage across the capacitor falls to zero as the charge is used up by the current flow. Now the energy stored in the coil's magnetic field induces a voltage across the coil, because inductor opposes the current change. Thus energy required to charge the capacitor is extracted from the magnetic field. A capacitor of 25 muF and inductor of 0.6 H are in an LC circuit. When the charge on capacitor is 3xx 10 ^(-5) C, what is the rate of change of current:

    Stored energy is

    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

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