Two charges, individual charge values?

[xvie]

1. Two point charges 3.0 cm apart have an electric potential energy -120 microJoules. The total charge is 30 nC. What is the lesser charge? What is the larger charge?



2. Uele=qv Uele=q1(kq/d)



3. My professor gave me these equations, I'm not entirely sure if they're the right ones. I haven't even attempted it - I just need help in figuring out how to work the problem. Thanks.

 

[Redbelly98]

Welcome to Physics Forums.

Uele=q1(kq/d)

Use that equation, and the values given in the problem statement. You'll have to think about how the statement "the total charge is 30 nC" can be applied here.