Faraday Cage - Electroscope

Purpose

To demonstrate that the electric field within a closed surface is zero.
 

Equipment

Double wire strainer Faraday cage with electroscope, charging materials, and projection point source.

 

Images

j3-22

Description

Charge the two wire strainers, which are connected electrically to the electroscope indicator. With the two meshes separated, the electroscope deflects. When they are placed together, forming a closed sphere, the electroscope deflection is zero, indicating zero potential within the closed cage. ◙