Question

Two protons will brought closer. How does the potential energy of system change

Answer 1

A repulsive force acts between protons, if they are brought nearer, work must be done by external force.

Hence the potential energy of system increases

Answer 2

here's the answer,

Potential energy will increase. This is because in bringing two protons closer, work has to be done against the force of repulsion. This is stored up in the form of potential energy. However, the potential energy will decrease when a proton and an electron are brought nearer.

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