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Question

An early model for an atom considered it to have a positively charged nucleus of charge Ze surrounded by a uniform density of negative charge up to a radius R. The atom as a whole is neutral. For this model, what is the electric field at a distance r from the nucleus, where r>R?

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Solution

The correct option is **C** Zero

We know that E due to a uniform spherically symmetric charge distribution is the same as E due to the total charge placed at centre of the distribution,

Therefore,

E=kQr2−kQr2=0 for r > R, where k = 14πϵ0 .

We know that E due to a uniform spherically symmetric charge distribution is the same as E due to the total charge placed at centre of the distribution,

Therefore,

E=kQr2−kQr2=0 for r > R, where k = 14πϵ0 .

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