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## Homework Statement

Consider the following figure.

image: http://www.webassign.net/grr/p17-18.gif" [Broken]

(a) Find the electric potential at points a and b for charges of +3.5 nC and -7.6 nC located as shown in the figure.

Va= _____ V

Vb= _____ V

(b) What is the potential difference ΔV for a trip from a to b?

_____ V

(c) How much work must be done by an external agent to move a point charge of +1.50 nC from a to b?

_____ J

## Homework Equations

v=Er?

U=kQ/r

## The Attempt at a Solution

I tried multiplying the distance by the charge, which was wrong. Then I tried taking (1/4 pie epsilon not) (charge/r) which was wrong. I don't know what to do, can you please help?

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