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Home  >>  AIMS  >>  Class12  >>  Physics  >>  Electric Charges and Fields
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An early model for an atom considered it to have a positively charged point 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 the above model, what is the electrical field at a distance r from the nucleus $(r < R)?$

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$(D) \frac{Ze}{4 \pi \in_0^2} \bigg( \frac{1}{r^2} -\frac{r}{R^3}\bigg)$
Hence d is the correct answer.
answered Jun 4, 2014 by meena.p

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