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## Homework Statement

## Homework Equations

## The Attempt at a Solution

we know the electric field at A is 0, so the force is 0.

V = work / charge = U / q = F⋅D / q

the electric field at B is 4 times 3.6N/C = 14.4 N/C

since E = F/q, F = Eq

force, F = 14.4q at point b

V = 14.4q⋅d/q

the q's cancel, d is the distance from A to b which is 4.47

V = 14.4 ⋅ 4.47 = 64.39

is this correct?