Answer :


The attractive nuclear force between two protons is,

(a)The power of e must be dimensionless.


Hence, SI unit of k is m.


Let us replace the formula with SI units

Hence, SI unit of C is Nm2



Separation between the protons, r = 5fermi = 5 × 10-15 m.

We know that the charge on a proton is q = 1.6 × 10-19C.



Formula used:

By Coulomb’s law, the electric force is given by:

Where ϵ0 is the permittivity of free space

k is the electrostatic constant

q1 and q2 are the magnitude of charges

r is the distance of separation between the charges


The electric force between the two protons is given by:

Also, the nuclear force between the protons is given by:

These two forces balance each other.



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