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Four positive point charges Q are …

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Four positive point charges Q are placed at the corners of a square of side a. Calculate the charge that should be placed at the centre so that system remains in equillibrium.

    • Posted by Abhay Tewari 6 years, 4 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Tripti Rawat 6 years, 4 months ago

    Let us assume, that the charge Q is placed at the centre of the square (having side a), so as to keep all the four charges in equilibrium. Clearly, charge Q has to be negative in nature to hold charges +q in equilibrium.

    If the net force on a charge +q at any corner (say A) is zero, then by symmetry it follows that the net force experienced by the other charges at other corners will also be zero.

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