Two point charges interact with each other. Discuss the sign of the electric pot

Question

Two point charges interact with each other. Discuss the sign of the electric potential at the location of the sec- ond charge (with respect to infinity) for all possible variations of the signs of the charges. That is, what will be the sign of the potential at the second charge in each of the four possible cases when the first charge is either positive or negative when the second charge is either positive or negative?

Explanation / Answer

1. if the first charge is positive 1.1 if second one is negative, that means that both charges will be attracted one to another. that means that we dont need to invest any work to bring second charge from infinity to its point --> potential energy will be negative 1.2 if second one is positive, that means that charges will be distracted one from another. that means that we need to invest work to bring second charge from infinity to its point --> potential energy will be positive 2. if first charge is negative 2.1 if second one is negative, that means that charges will be distracted one from another. that means that we need to invest work to bring second charge from infinity to its point --> potential energy will be positive 2.2 if second one is positive, that means that both charges will be attracted one to another. that means that we dont need to invest any work to bring second charge from infinity to its point --> potential energy will be negative

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