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Question

The mass of the sphere is 3.2×1014 kg and it carries a net charge equal to that of 10 electrons. If the electronic charge is 1.6×1019 C and the acceleration of free fall is 10ms2 the field required to keep the sphere stationary is

A
5×106Vm
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B
5×105Vm
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C
2×105Vm
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D
2×104Vm
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Solution

The correct option is C 2×105Vm
Electrostatic force Gravitational force

qE = mg; q = ne

E=3.2×1014×1010×1.6×1019=2×105 V/m

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