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Define surface density of electric charg...

Define surface density of electric charge.
Two large conducting spheres carrying charges `Q_(1)` and `Q_(2)` are brought close to each other. Is the magnitude of the electrostatic force between them exactly given by `(Q_(1)Q_(2))/(4 pi epsilon_(0)r^(2))` where r is the distance betwen their centres?

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UNITED BOOK HOUSE-QUESTION PAPER 2017-EXERCISE
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