• A metal sphere of radius 10 cm is mounted to an insulating stand and is connected (with some conducting material) to an electro-meter of negligible capacitance. The meter reads 15 kV. Another uncharged metal sphere (also mounted to an insulating stand), which is far from the first one, is connected to the charged sphere with a thin piece of wire. Then the reading on the meter is 10 kV. What is the radius of the initially uncharged sphere ?

    (1)50 cm(2)10 cm(3)15 cm(4)5 cm

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