Originally Posted by

**topher0805** I've got a quiz tomorrow on Electric Flux and I'm having a really hard time understanding it. My Prof gave us 4 sample questions to study in preparation for the quiz. If someone could walk me through this first one I'd be extremely grateful.

An uncharged, non-conducting sphere of radius 10cm is placed at the origin. A charge of 2nC is placed at the point $\displaystyle r_{1} = \hat{i} + 2\hat{j} + \hat{k}$ cm. What is the electric flux through the sphere's surface, assuming this is the only charge in the universe?

The answer is $\displaystyle \frac{2 * 10^{-9}}{\epsilon_0}$ .