A moving electron approaches another electron. What would be the change in the potential energy of this system ?

Options

A. Remains constant
B. Increases
C. Decreases
D. May increase or decrease

Answer

A, C

Explanation

Potential energy for a system of two electron
`U=(k(-e)(-e))/(r) `
`= (ke^(2))/(r)`
where `ke^(2)` is constant
`:. U prop (1)/(r)`
`:.` As r decreses U increases.