Aneutron consists of one "up" quark of charge +2e/3 and two "down" quarks each having charge -e/3. if we assume that the down quarks are 4.6 × 10-15 m apart inside the neutron, what is the magnitude of the electrostatic force between them?

The magnitude of the electrostatic force is 120.85 N

Explanation:

We can use Coulomb's law to find the electrostatic force between the down quarks.

In scalar form, Coulomb's law states that for charges and separated by a distance d, the magnitude of the electrostatic force F between them is:

where is Coulomb's constant.

Taking the values:

and knowing the value of the Coulomb's constant:

Taking all this in consideration:

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.