KCET 2019 Physics Solved Paper

(A)
Potential energy of a system of charges is U = (

1

4πε0

)

q1q2

2

In case of like charges, (q1q2) is positive
when r increases, U decreases
In case of unlike charges, (q1q2) is negative
when r increases, | U | decreases
but because of negative sign, U increases.