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Why does the electric field inside a die...

Why does the electric field inside a dielectric decrease when it is placed in an external field ?

Text Solution

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It is because the dielectric gets polarised.
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Knowledge Check

  • Due to polarisation the electric field inside a dielectric is

    A
    decreased
    B
    increased
    C
    remains same
    D
    may increase or may decrease depending the upon material

  • What happens when a conductor is placed in an external electric field?

    A
    The free charge carriers move and charge distribution In the conductor adjusts Itself In such a way that the electric field due to Induced charge opposes the external field within the conductor
    B
    In the static situation, the two fields cancel each other and the electrostatic field In the conductor Is zero
    C
    Both (1) and (2)
    D
    Neither (1) nor (2)

  • An electric dipole in a uniform electric field experiences (When it is placed at an angle theta with the field)

    A
    Force and torque both
    B
    Force but not torque
    C
    Torque but not force
    D
    No force and no torque

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    Assertion: When a dielectric material is kept inside some external electric field then the net electric field intensity inside the volume of dielectric is always less than external electric field intensity. Reason: In a normal state, polar molecules of dielectric material are randomly oriented and their net electric field remains zero. If we apply electric field on a dielectric material then the polar molecules experience torque and gets aligned along its direction.

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