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lemaire

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## Homework Statement

A thin plastic rod 15 cm long carries 4.2 nC distributed uniformly over its length.

(a) If the rod is bent into a ring, find the potential at its center.

(b) If the rod is bent into a semicircle, find the potential at the center (i.e., at the center of the circle of which the semicircle is part).

## Homework Equations

V = KQ/r potential at a point.

## The Attempt at a Solution

when bending the rod, how to find the distance r.