The electric field inside a conductor is always zero. This principle is used in many places. When a crash of thunder or a flash of lightning occurs, it is safer to sit inside a bus or a car than to sit under a tree. This is because electric field inside the metal body of a bus or a car is zero. So a person sitting inside a car or a bus remains unaffected by the electric discharge resulting from thunder or lighting. The process of isolating a certain region of space from an external field is called electrostatic shielding. (Fascinating phenomenon!!!).
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