Question

how does a closed metallic body acts as an electrostatic sheild?

Answer 1

A closed metallic body acts as an electrostatic shield.Electrostatic shielding is a process by which electric field around a space is made zero. This can be done by applying Gauss’s theorem. We know that electric field does not exist inside a hollow metallic sphere not containing charge. Now the space where we need no electrical field, can be enclosed inside a metallic box. Then there will be no electric field inside the enclosure. Electric shielding is used to protect electrical circuits from static electricity.