1. The problem statement, all variables and given/known data Give an expression to find V of Arc of uniform charge (at the center, or origin) 2. Relevant equations V=kQ/R 3. The attempt at a solution the solution is kQ/R. I'm wondering why an arc can be treated like a point charge... Is this reason partly connected to a conducting sphere, and the fact is has an equal charge distribution everywhere, even at its hollow center? Likewise, would a uniform arc also be seen as a hollow conducting sphere?