- #1

gruba

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## Homework Statement

Find electric potential at a center of charged rod with charge 'Q' and length '2a' if referent point is at infinity.

## Homework Equations

Electric potential of a point charge: V=kQ/r

Electric potential via electric field: integral (Edl)

## The Attempt at a Solution

I used relation for potential of point charge:

V=kQ/(1/r_A-1/r_B), where r_A is a distance between charge and point, and r_B is the distance of infinity. From there, I think that r_A=a because that is the maximum distance between point and charge (point lies on the rod). This gives

V=kQ/a

Is it right that if we calculate potential of this rod in a given point, where referent point is at infinity, we can look at the rod as a point charge?

Could someone show the steps if this isn't correct?

Thanks for replies.