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  4. A metallic shell has a point charge q kept inside its cavity. Which one of the following diagrams correctly represents the electric field lines?

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Q. A metallic shell has a point charge $q$ kept inside its cavity. Which one of the following diagrams correctly represents the electric field lines?

NTA AbhyasNTA Abhyas 2020Electrostatic Potential and Capacitance

Solution:

Electric field is zero everywhere inside a metal (conductor) i.e., field lines do not enter a metal plus these are perpendicular to a metal surface.