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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.