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JEE Main 2020 (6 Sep, Shift 2) · Electric Flux & Gauss's Law

Electric Flux & Gauss's Law question from JEE Main 2020 (6 Sep, Shift 2)

Q92JEE Main 2020 · 6 SEP · SHIFT 2Easy

Electric Flux & Gauss's Law

Consider the force F on a charge 'q' due to a uniformly charged spherical shell of radius R carrying charge Q distributed uniformly over it. Which one of the following statements is true for F, if 'q' is placed at distance r from the centre of the shell?

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Answer: (b)

Inside a uniformly charged shell ( $r < R$ ): $E = 0$ , so $F = 0$ .
Outside ( $r > R$ ): the shell acts as a point charge at the centre, $F = \dfrac{1}{4\pi\varepsilon_0}\dfrac{qQ}{r^2}$ .
So the answer is (b).

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