Question

A student is provided with a rubber cylinder and a patch of synthetic fur. The rubber cylinder and the patch are electrically neutral. The student rubs the cylinder back and forth along the fur. A short time later, after the cylinder and fur have been placed on insulating stands, the student determines that the fur has a net negative electric charge.

Which of the following claims is correct about the system that contains only the patch of fur?

• It is an isolated system.

  A

• It is a closed system.

  B

• It is an open system.

  C

• The type of system cannot be determined unless information is known about the net force exerted on the system at any given time.

  D

Answer 1