# Potential with an edge

Electricity and Magnetism Level 3

A thin disc of radius $$\displaystyle R = 10 \text{ cm }$$made of non-conducting material is charged uniformly so as to acquire a uniform surface charge density $$\displaystyle \sigma = 5 \text{ nC}/\text{m}^2$$.

Find the potential at the edge of the disc in Volts.

Details and Assumptions

• $$\displaystyle \frac{1}{4 \pi \epsilon _{0} } = 9 \times 10^{9} \text{ N}\cdot \text{m}^2 / \text{C}^2$$
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