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Define dielectric constant of a medium i...

Define dielectric constant of a medium in terms of force between electric charges.

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The dielectric constant of a medium is the ration of force between two charges placed some distance apart in vacumm to the force between same two charges placed same distance apart in the given medium.
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Knowledge Check

  • If the dielectric constant of a medium increases then the number of electric lines of force passing through that medium

    A
    decreases
    B
    increases
    C
    remains same
    D
    none of these

  • If two charges are kept in a material of dielectric constant what is the ratio of force between them:

    A
    `16:1`
    B
    `2:1`
    C
    `4:1`
    D
    `1:1`

  • If S is the surface area of charged conductor on which the surface density of charge is and K is the dielectric constant of the medium around it, then outward force acting on the surface of the conductor is

    A
    `(sigma^(2))/(2epsi_(0)K)`
    B
    `(sigma)/(epsi_(0)K)S`
    C
    `(sigma^(2))/(2epsi_(0)K)S`
    D
    `(sigma^(2))/(epsi_(0)K)S`

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    A parallel plate capacitor with a dielectric slab with dielectric constant k= 3 filling the space between the plates is charged to potential V and isolated. Then the dielectric slab is drawn out and another dielectric slab of equal thickness but dielectric constant k'= 2 is introduced between the plates. The ratio of the energy stored in the capacitor later to that initially is:

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