How much work is done. Physics problem

[xswtxoj]

#9

Homework Statement

1. A +38 uC charge is place @ 41cm from an identical +38uC. If assuming the potential identity is 0. what's the potential midway btw the 2 charges?
2. How much work is done to move a 0.40 uC charge from a point midway between the charge to a point 10 cm closer to either of the charges?

Homework Equations

V= m/q ?
F= Ke qq/r

The Attempt at a Solution

Not sure where to start but...
8.99e-19(38e-6)(q3)/(.041m-x )^2
8.99e-19(38e-6)(q3)/(x )^2

 

[LowlyPion]

Simply calculate the ΔV because that times q is your work.

 

[xswtxoj]

so i used V= Ke q/r?