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If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by Fₚₚ, Fₙₙ and Fₚₙ respectively, then:

1. Fₚₚ = Fₙₙ = Fₚₙ
2. Fₚₚ ≠ Fₙₙ and Fₙₙ = Fₚₙ
3. Fₚₚ = Fₙₙ ≠ Fₚₙ
4. Fₚₚ ≠ Fₙₙ ≠ Fₚₙ

Correct answer: Fₚₚ = Fₙₙ = Fₚₙ

Solution

The nuclear force is charge-independent and acts equally between any pair of nucleons (proton-proton, neutron-neutron, or proton-neutron). Hence, Fₚₚ = Fₙₙ = Fₚₙ.

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