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(B) The nuclear force is a short-range force, typically effective within a range of a few $fm$ $(1 \, fm = 10^{-15} \, m)$.Whereas, the electromagneti

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$F_{e} \gg F_{n}$

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(B) The nuclear force is a short-range force, typically effective within a range of a few $fm$ $(1 \, fm = 10^{-15} \, m)$.Whereas, the electromagnetic force is a long-range force that follows the inverse-square law.Given the separation is $10 \, nm = 10 	imes 10^{-9} \, m = 10^{-8} \, m$.Since $10^{-8} \, m$ is much larger than the range of the nuclear force $(\, 10^{-15} \, m)$, the nuclear force $F_{n}$ is effectively zero at this distance.Therefore, the electromagnetic force $F_{e}$ is significantly greater than the nuclear force $F_{n}$, i.e., $F_{e} \gg F_{n}$.

Two protons are kept at a separation of $10 \, nm$. Let $F_{n}$ and $F_{e}$ be the nuclear force and the electromagnetic force between them, respectively.

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