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A path ball of mass 1g carrying an elect...

A path ball of mass 1g carrying an electric charge of 980 esu is dropped on a charged sphere of radius 10 cm from a height of 1m above the centre of the latter. It is found that the pith ball momentarily comes to rest on the charged sphere before being repelled away again. Calculate the charge on the sphere.

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The correct Answer is:
1000 esu of charge
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