A neutron is thought to be composed of one “up” quark of
charge and
two “down” quarks each having charge . If
the down quarks are apart
inside the neutron, we have to calculate the repulsive electrical force between
them.
It is given that the separation between the two down-quarks inside a neutron
is
.
Therefore, the magnitude of the force of repulsion between the two down-quarks
inside a neutron will be