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A copper ball of density 8.6 g cm^-3 cm ...

A copper ball of density `8.6 g cm^-3` cm in diameter is immersed in oil of density `0.8 g cm^-3`. If the ball remains suspended in oil in a uniform electric field of intensity `36,000 NC^-1` acting in upward direction, what is the charge on the ball?

A

`3.3xx10^-18C`

B

`3.2xx10^-18C`

C

`1.6xx10^-18C`

D

`4.8xx10^-18C`

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