Homework Statement
They're in the attachment
Homework Equations
V=kQ/r
The Attempt at a Solution
I was absent during this class,so I have no idea,but I attempted question a which is the potential at point a,b
Point a=(9*10^9 * 10*10^-6/0.2)
Point B=(9*10^9 * -8*10^-6/0.3)