If Fpp,Fnn and Fpn denote, respectively, the nuclear forces between two protons, between two neutrons and between a proton and a neutron, then
A
Fpp=Fnn=Fpn
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B
Fpp≠Fnn≠Fpn
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C
Fpp=Fpn≠Fnn
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D
Fnn=Fpn≠Fpp
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Solution
The correct option is DFnn=Fpn≠Fpp
Given −∗Fnn= Force between two neutrons. ∗FPp= Force between two protons. ∗Fpn= Force between neutron and proton.
Since, neutron is a neutral particle having no net charge. Hence, the force between neutron-neutron and neutron-proton is equal. A proton is a charged particle, and when two protons tends to approach, the electrostatic forces repel them and decreases the proton-proton force.
⇒Fpp<FPn=Fnn or Fpp≠Fpn=Fnn Hence, option (d) is correct.