A) \[{{10}^{-12}}m\]
B) \[{{10}^{-15}}m\]
C) \[{{10}^{-10}}m\]
D) \[{{10}^{-8}}m\]
Correct Answer: B
Solution :
Key Idea: Nuclear force is effective within the nuclear diameter. In a nucleus, the positively charged protons and the electrically neutral neutrons exist together in an extremely small space \[(\approx {{10}^{-15}}\,m).\] Naturally there are some forces operating within the nucleus which bind the nucleons together. According to Coulombs law, these forces are \[F=k\frac{{{q}_{1}}{{q}_{2}}}{{{r}^{2}}}.\]They are extremely short range, this means these forces are effective for very short distance only that is within the nuclear diameter \[={{10}^{-15}}\,\text{m}\text{.}\]
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