A metal box is placed in a space which has an electric field .What is the field inside ? Explain

Ans : The field inside is zero (there is electrostatic screening )

Q . An electron moves along a metal tube with variable cross – section . How will its velocity change when it approaches the neck of the of the tube ?

Ans : Positive induced charges will appear on the neck of the tube and accelerate the electron

Author: Rajesh Jha

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