If the nuclear force between two protons, two neutrons and between proton and neutron is denoted by `F_(p p), F_(n n)` and `F_(pn)` respectively, then

A force between two protons is same as the force between proton and neutron. The nature of the force is

F_(pp),F_("nn")and F_(np) are the nuclear forces between proton - proton , neutron - neutron and neutron - proton respectively . Then relation between them is

F_(pp),F_("nn")and F_(np) are the nuclear forces between proton - proton , neutron - neutron and neutron - proton respectively . Then relation between them is

Nuclear force between proton-proton is ______________.

Nuclear force between proton-proton is ______________.