What are the forces between a proton and another proton? I think they are electromagnetic, gravitational and nuclear.
Forces between proton and electron? I think, electromagnetic, gravitational and nuclear again.
Between neutron and proton? I think there won't be any electromagnetic force here, but gravitational and nuclear will be present. Same for neutron and electron?
Between neutron and neutron only nuclear and gravitational.
Between two electrons? Will there be nuclear? I think electrostatic and gravitational will exist.
Thank you in advance..
Best Answer
Q:What are the forces between a proton and another proton?
An: Nuclear $α_{s}=1$
Q:Forces between proton and electron?
An: Electromagnetic $α=1/137$
Q:Between neutron and proton?
An: Nuclear $α_{s}=1$
Q:Between neutron and neutron?
An: Nuclear $α_{s}=1$ (nuclear forces are independent from electromagnetic charge)
Q:Between two electrons?
An: Electromagnetic $α=1/137$
Gravity is everywhere in all cases but negligible $α_{g}=10^{-39}$ in quantum scale.
For quarks and leptons there is also the weak interaction that changes the flavor of the particles but also can cause attraction or repulsion. The coupling constant of this force is $α_{w}=10^{-6}$.
The larger the coupling constant $a$ (in the case of the electromagnetic force it is referred as Fine Structure Constant) the stronger the related force.