Work Done by moving point charge

[DANIELLYMA]

Hi I think I figured it but I'm not sure.

Here's the problem:

How Much Work In Fig. 25-34, how much work is required to bring the charge of +5q in from infinity along the dashed line and place it as shown near the two fixed charges +4q and –2q? Take distance d = 1.40 cm and charge q = 1.6 × 10–19 C.

I summed up the Vpotential at the point which I got 0 Volts

Then I used W = qt(Vp-Vinfinity) = 0J. It just seems too simple to be correct.

 

[chrisk]

You image does not open. Can you describe it?

 

[Bacat]

This can't be solved without knowing the relative spacings of all the charges. The net repulsion/attraction will determine how much potential energy is stored by the work. Can you describe the particle positions using a coordinate system?

 

[DANIELLYMA]

Edit: I reuploaded the picture, thanks for your replies