Question
If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by $${F_{app}},{F_{nn}}$$ and $${F_{pn}}$$ respectively, then
A.
$${F_{pp}} \approx {F_{nn}} \approx {F_{pn}}$$
B.
$${F_{pp}} \ne {F_{nn}}\,{\text{and}}\,{F_{pp}} = {F_{nn}}$$
C.
$${F_{pp}} = {F_{nn}} = {F_{pn}}$$
D.
$${F_{pp}} \ne {F_{nn}} \ne {F_{pn}}$$
Answer :
$${F_{pp}} = {F_{nn}} = {F_{pn}}$$
Solution :
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.