Answer to Question #222147 in Electricity and Magnetism for Kiola Diamond

Question

The outer surface of the cardboard center of a paper tower roll ________________

a. is a possible Gaussian surface

b. cannot be a Gaussian surface because it is not a closed surface

c. cannot be a Gaussian surface since it is an insulator

d. cannot be a Gaussian surface because it encloses no charge

Answer 1

b. Cannot be a Gaussian surface because it is not a closed surface.

For a Gaussian law suits any closed surface.

In this case with assuming that paper towel roll is not closed surface.