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## Homework Statement

It's me again..

I solved this question but i want to be sure about it,so what do you think about my solution bellow?

a dipole consists of a positive charge q at x=d/2 and a negative charge -q at x=-d/2 (d is the distance between the charges). What is the potential produced by the dipole at a point distance y from the center of the dipole(on an axis forming 90 degrees with the dipole)?

a)0

b)kqd/y^2

c)kqd/x^2

d)qd

## Homework Equations

for a dipole :

V=K.q.d.cos(teta)/x^2

## The Attempt at a Solution

so here we have this figure

http://img827.imageshack.us/img827/8777/123sei.jpg [Broken]

teta is equal to 90 no? cos(90)=0

si V=k.q.d.cos(teta)/y^2--->=0 because cos90=0

so A

True?

Evening!! :)

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