A proton and an electron are attracted towards each other .Will their P.E increase or decrease ?

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Solution

Well $,$ these are two particles with mass and equal charge with different sign $,$ and masses $,$ so there are two types of potential energy $,$ electric and gravitational $.$
You can field each potential $,$ since each is inversely proportional to the distance between them $,$ therefore as the distance decreases the potential increases $.$

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