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A conductor is an extreme case of a diel...

A conductor is an extreme case of a dielectric, because if an electric field is applied to a conductor, charges are free to move within the conductor to set up ''induced charges''. What is the dielectric constant of a perfect conductor? Is it `K=0,Krarroo`, or something in between ? Explain your reasoning.

Text Solution

Verified by Experts

Electric field in a dielectric is `E=E_(0)//K,` in a conductor `E=0`,
so `K=oo`.
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Knowledge Check

  • When electric field (vec(E)) is applied on the ends of a conductor, the free electrons starts moving in direction

    A
    similar `vecE`
    B
    Opposite `vecE`
    C
    perpendicular to `vecE`
    D
    cannot be predicted

  • Assertion : Electric field inside a conductor is 0. Reason : Charge is present on surface of conductor.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • The energy density of a medium of dielectric constant k surrounding the charged conductor is

    A
    `(sigma^(2))/(2in_(0)k)`
    B
    `1/2in_(0)kE^(2)`
    C
    `sigma/(in_(0)k)`
    D
    both 'a' and 'b'

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