In which region is it possible for electric potential = 0?

[pinkie9211]

Two charges that are shown:
I (4uC) II (-2uC) III
In which regions all the line connecting the charges is it possible for the electric potential to be zero?

1. Homework Statement
They are 0.01m apart

Homework Equations

The Attempt at a Solution

I understand that the 4uC charge and the -2uC charge are going to attract...but I have no idea where the potential could be equal to zero.

 

[Simon Bridge]

Hint:
What is the equation for the electric potential of a point charge?
What si the rule for combining electric potentials?

 

[pinkie9211]

V= kQ/r

and I'm not sure...

 

[Simon Bridge]

Indeed $V(\vec r)=kQ/r$ for a point charge $Q$ at the origin.
If you have two or more charges, then the electric potentials add up.