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Q55 (NDA-II/2010) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

A hollow metal ball carrying an electric charge produces no electric field at points

Result
Your answer: —  Â·  Correct: C
Explanation

A hollow metal ball (a conducting sphere) carrying an electric charge produces no electric field at points inside the sphere. According to Gauss's Law, the electric flux through a closed surface is proportional to the net charge enclosed [t1][t8]. In a conductor, excess charges redistribute themselves to the outer surface to reach electrostatic equilibrium, ensuring the internal electric field is zero [t1][t5]. If a Gaussian surface is drawn anywhere inside the hollow cavity of the sphere, the enclosed charge (q) is zero, which mathematically results in an electric field (E) of zero [t6][t7]. While the field outside the sphere behaves like that of a point charge located at the center, the field within the interior volume remains null regardless of the sphere's total charge [t1][t5]. This principle is the basis for electrostatic shielding.

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