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Prerequisites

### Total Charge

Suppose that a spherical shell $B$ has inner radius $a$ and outer radius $b$ with a spherically symmetric internal charge density $\rho®=10kr^2$. What is the total charge?

Suppose instead that the shell is cylindrical, with the same inner and outer radii, but with a cylindrically symmetric internal charge density $\rho®=10kr^2$. What is the total charge?

*Do you see the difference?? The coordinates $r$ in these two examples
are different, with the first being the spherical radius, and the second being
the cylindrical radius!*

: **Add some questions about theta and delta functions and limits**