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Suppose I have earthed conducting sphere of radius $ a $ . And if we keep a change $ +Q $ at a distance $ d $ from the centre of the sphere then a charge of $ \frac {-Qa}{d} $ will be induced $ \frac {a²}{d} $ distance from the centre and $ \frac {Qa}{d} $ charge at centre is grounded. But why not the $ \frac {-Qa}{d} $ ? And similarly if I put $ +Q $ and $ -Q $ charge to the both sides of the sphere similar thing happens :- the positive charge at the centre is grounded? Why does that happen? I don't really understand. Please someone help as quick as possible.

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