**Goal:** Link flux and enclosed charge.

**Source:** 283-410 Flux greatest?

Consider the flux through the following spherical Gaussian surfaces.

Take each charge distribution to be either a point charge or a spherical

shell of charge (uniformly distributed). For which situation is the flux

greatest?

- a and c
- a, b, and c
- b
- a
- b, c, and e
- a, f, and g
- b, c, and g
- Other

## Commentary:

## Answer

(2) All these have the same flux. Some students do not read the question

carefully and think the number of ‘+’ signs matter.