Answer :
Protons within a nucleus are attracted to each other because of a)the nuclear force.So,correct option is a.
One thing that actually helps to reduce the repulsion between the protons within a nucleus is due to the presence of neutrons. Since they have no charge so, they don't add to the repulsion which is already present, and they help to separate the protons from each other so they don't feel as strong a repulsive force from any other nearby protons.Because of presence of neutons,nucleus attracts the protons with strong nuclear force.
Now two type of force are acting on proton one is repulsive force due to same charge and nuclear force due to protons.Here nuclear force are more stronger than repulsive force due to that nucleus remains stable.
Hence, correct option is a.
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(Complete question) is:
protons within a nucleus are attracted to each other by group of answer choices
a) the nuclear force.
b)opposite charges.
c) their energy levels.
d)electron repulsion.
