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[" 9.The excess (equal in number) of ele...

[" 9.The excess (equal in number) of electrons that must be "],[" placed on each of two small spheres spaced "3cm" apart,with "],[" force of repulsion between the spheres to be "10^(-19)N" is "],[[" (a) "25," (b) "225," (c) "625," (d) "1250]]

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