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The insulation property of air breaks do...

The insulation property of air breaks down at `E=3xx10^(6) "volt"//meter`. The maximum charge that can be given to a sphere of diameter `5m` is approximately (in coulombs)

A

`2xx10^(-2)`

B

`2xx10^(-3)`

C

`2xx10^(-4)`

D

`2xx10^(-5)`

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