When the neutrons are added to the atoms, the nucleus mass is increased. So, the nuclear force will increase and electrostatic force will remain unchanged. The correct option is D.
The force of attraction due to the electrons is called as the electrostatic force.
The nucleus consist of neutrons and protons. The protons have charge on them. This charge puts a force on the surrounding objects which is called as nuclear force.
When we add a neutron, the mass of the nucleus is increased. The force of attraction or repulsion is directly proportional to the mass. Thus, there will be an increase in the nuclear force.
Since no electrons are added, the electrostatic force remains unchanged.
The correct option is D.
Learn more about Nuclear force and electrostatic force.
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