20 points
Which of the following is true about the potential energy between charged particles. Choose the two that apply.

a
Potential energy increases as like charges get closer.
b
Potential energy increases as opposite charges get closer.
c
Potential energy remains the same between like charges as they move apart.
d
Potential energy increases as any charges move closer together.
e
Potential energy decreases as opposite charges get closer.
f
Potential energy decreases as like charges get closer together.