Question

In the mini derivation of the charged conductor's surface field, what is used with Gauss's law?

Options

• A conducting rope dragging on the ground.

• A small Gaussian pillbox at the surface of a charged conductor.

• A test charge moved along the conductor's surface.

• An electroscope placed inside a cavity.

Answer 1

A small Gaussian pillbox at the surface is used to apply Gauss's law. The field inside the conductor is zero, so flux comes only from the outer face.