Find an expression for the electric potential

[unger36]

Homework Statement

Find an expression for the electric potential a distance z away from the center of rod on the line that bisects the rod.

Express your answer in term of k, Q, L, z and appropriate constants.

Here is the picture.

Homework Equations

The Attempt at a Solution

I'm thinking it should be (kQL)/z. I just can't figure out why that isn't correct.

 

[gabbagabbahey]

Hi Unger, welcome to PF!

The Attempt at a Solution

I'm thinking it should be (kQL)/z. I just can't figure out why that isn't correct.

Why do you think it is kQL/z?...That doesn't even have the correct units for potential!

Instead of blindly guessing at the answer, you should try to actually calculate it!

Hint: Use Coulomb's Law for a continuous charge distribution.