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Radioactivity - Charging of a Sphere

A radioactive source in the form of a metal sphere of diameter 10^−3m emits beta particles at a constant rate of 6.25 x 10^10 particles per second. If the source is electrically insulated, how long will it take for its potential to rise by 1 volt, assuming that 80% of emitted beta particles escape from the surface.

Solution Summary

The solution explains how the charge accumulated is related to the capacitance of the sphere.