A radioactive source in the form of a me...

A radioactive source in the form of a metal sphere of diameter 3.2×10^ −3 m emits β-particle at a constant rate of 6.25×10^ 10 particle/sec. The source is electrically insulated and all the β-particle are emitted from the surface. The potential of the sphere will rise to 1 V in time

`180 mus`

`90 mus`

`18mus`

`9mus`

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