Q 1206434378.     A radioactive source in the form of metal sphere of diameter `10^(-3)` m emits beta particle at a constant rate of `6.25 × 10^10` particles per second. If the source is electrically insulated, how long will it take for its potential to rise by `1.0` volt, assuming that `80%` of the emitted beta particles escape from the source?

A

`2.15` μ sec

B

`1.95` μ sec

C

`6.95` μ sec

D

`0.95` μ sec

HINT

Use `Q = C × V`
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