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## Homework Statement

A rectangle has sides of length 5cm (right and left) and 15cm (top and bottom).

Top left corner has charge (q1) = -5uC

Top right corner has charge A = ?

Bottom left corner has charge B = ?

Bottom right corner has charge (q2) = 2uC

a) What are the electric potentials of A and B

b)How much external work is required to move a third charge (q3 = 3uC) from B to A along the diagonal of the rectangle

## Homework Equations

Not too sure. For part b I'm thinking I would use a line intergral and say that the diagonal path from A to B is equivilent to going from B to q1, then q1 to A.

V = U/Qo

But where will I get U (potential energy) from?

## The Attempt at a Solution

What I really want is part a, once part a is done I can just do some line intergrals to find the work done for part b.

Do I use equipotentials? So potential of A is the same as potential of q1? B is the same as q2?

Any pointers and I'm very grateful.