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A very small sphere of mass 80 g having ...

A very small sphere of mass `80 g` having a charge q is held at a height of `9 m` vertically above the center of a fixed conducting sphere of radius `1 m`, carrying an equal charge q. When released, it falls until it is repelled back just before it comes in contact with the shpere as shown in Fig. 47. Calculate the charge `q. [g = 10 ms^-2]`.

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