- #1

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## Homework Statement:

- The following is a derivation of Gauss's Law using the solid angle.

## Relevant Equations:

- $$\Phi _e=\oint_{S}^{} \vec{E}\cdot d\vec{A}$$

I'm a bit confused on the derivation above. I understand what the goal of the derivation is, as it derives Gauss's Law using the solid angle, but i was wondering if someone could kind of fill in the steps the author skipped and explain the use of the solid angle.