Question

What Gaussian surface is used for a uniformly charged thin spherical shell?

Options

• A concentric spherical surface of radius \[r\]

• A coaxial cylinder of radius \[r\]

• A rectangular pillbox of area \[A\]

• A sphere whose centre is outside the shell

Answer 1

A concentric spherical surface matches the spherical symmetry of the charged shell. Its radius \[r\] is used to examine points inside, on, or outside the shell.