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Question

Find the electric force between two protons separated by a distance of 1 fermi (1 fermi=1015m). The protons in a nucleus remain at a separation of this order.

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Solution

The distance between the two protons is 1015 m.
The amount of charge on a proton is 1.6×1019 C

Electric force is given by
=Fe=keer2=ke2(1015)2

=9×109×(1.6×1019)2(1015)2

=9×109×(1.6)2×10381030=90×(1.6)2=230.4N

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