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The force of attraction between two char...

The force of attraction between two charges `+30 xx 10^(-9)C and -20 xx 10^(-9)C` seperated by a distance of 020m is found to be `5 xx 10^(-5)N. Find the relative permittivity of the medium.

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The correct Answer is:
2.7
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Two point charges +5xx10^(-19)C and +20xx10^(-19)C are separated by a distance of 2m. The electric field intensity will be zero at a distance d=………. From the charges of 5xx10^(19)C .

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Knowledge Check

  • The force between two small charged spheres having charges of 1xx10^(-7)C and 2xx10^(-7)C placed 20 cm apart in air is

    A
    `4.5xx10^(-2)N`
    B
    `4.5xx10^(-3)N`
    C
    `5.4xx10^(-2)N`
    D
    `5.4xx10^(-3)N`

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