In a quark model of elementary particles, a neutron is made of one up quark of charge $\frac{2}{3}\epsilon$ and two down quark of charges $\left(\frac{-1}{3}e\right)$ . if they have a triangle configuration with a side length of the order of ${10}^{-15}$ m. the electrostatic potential energy of the neutron is MeV is:

Quark model of element particles, a neutron is made of one up quark of charge $\frac{2}{3}\epsilon$ the two down quark at charge $\left(-\frac{1}{3}e\right)$.

We know,

Protons, neutrons are each composed of three quarks triangle configuration with side length of the order of $={10}^{-15}m$.

electronic potential energy $=\frac{1}{2}{mV}^2$

                                              $=\frac{1}{2}{lq}^2$

                                              $=\frac{1}{2}\times \frac{2}{3}\times \left(-\frac{1}{3}\times 2\right)\times {10}^{-15}$

 

                                             $=\frac{2}{9}\times {10}^{-15}$

                                              $=-0.48$