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Question

In the nucleus of helium if F1 is the net force between two protons F2 is the net force between two neutrons and F3 is the net force between a proton and a neutron. Then,

A
F1=F2=F3
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B
F>1F2>F3
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C
F>2F3>F1
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D
F3=F1>F2
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Solution

The correct option is D F3=F1>F2

Nuclear forces are the strong forces of attraction which hold together the nucleons (neutrons and protons) in the tiny nucleus of an atom, inspite of strong electrostatic forces of repulsion between protons. Nuclear forces act between a pair of neutrons, a pair of protons and also between a neutron, proton pair with the same strength. This shows that nuclear forces are independent of charge.
The attractive nuclear force is the same for any pair of nucleons. ThusF1=F3 when there are no electrostatic forces, but F2= attractive nuclear force - repulsive electrostatic force
Hence
F3=F1>F2

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