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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 lines of forces ?

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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 lines of forces ?

IIT JEEIIT JEE 2003Electric Charges and Fields

Solution:

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