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Consider the following very rough model ...

Consider the following very rough model of a beryllium atom. The nucleus has four protons and four neutrons confined to a small volume of radius `10^(-15)m`. The two 1s electrons make a spherical charge cloud at an average distance of `1.3 xx 10^(-11)` m from the nucleus, whereas the two 2s electrons make another spherical cloud at an average distance of `5.2 xx 10^(-11)` m from the nucleus. Find the electric field at (a) a point just inside the 1 s cloud and (b) a point just inside the 2s cloud.

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