The mass of the sphere is 3.2×10−14kg and it carries a net charge equal to that of 10 electrons. If the electronic charge is −1.6×10−19C and the acceleration of free fall is 10ms−2 the field required to keep the sphere stationary is
A
5×10−6Vm
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B
5×10−5Vm
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C
2×105Vm
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D
2×10−4Vm
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Solution
The correct option is C2×105Vm Electrostatic force Gravitational force