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# Electric Fields

Electric fields describe the interaction of stationary charged matter. They underlie the working of diverse technology from atom smashers to the poor cell reception you're getting right now.

A typical height for a cloud to ground lightning strike is 1 km.

What is the total voltage difference between the cloud and the ground right before the lightning strike **in Volts**?

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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