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JEE Main · 2024 · 04 Apr 2024 · Shift 2 · Electrostatics

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A charge q is placed at the center of one of the surface of a cube. The flux linked with the cube is :-
  1. (A)
  2. (B)✓ Correct
  3. (C)
  4. (D)Zero

Answer: (B)

Solution

Place a mirror-image copy of the cube on the other side of the face that carries the charge . Together the two cubes completely enclose the point charge , so by Gauss's law the total flux through the combined (closed) surface is . By symmetry this splits equally between the two cubes, so the flux through the original cube is

JEE Main · 2024 · 04 Apr 2024 · Shift 2 · Single correct option

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