## PHYS208 Fundamentals of Physics II

### Hint for Ch. 24, 25P

Use cylindrical gaussian surfaces, coaxial with the charged cylinders.

### Hint for Ch. 24, 31P

Use a cylindrical gaussian surface, coaxial with the charged cylinder.
Remember that the charge enclosed when *r < R* is only a fraction of the total charge. Set up an integral to evaluate the enclosed charge.

### Hint for Ch. 24, 32E

One word -- *superposition*!

### Hint for Ch. 24, 52P

Use a spherical gaussian surface, centered about the center of the charge sphere.
Remember that only a fraction of the total charge is enclosed by the gaussian surface
when *r < R*.
Set up an integral to evaluate the enclosed charge and the total charge.

"http://www.physics.udel.edu/~watson/phys208/exercises/hints/0304.html"

Last updated March 5, 1998.

Copyright George Watson, Univ. of Delaware, 1997.