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JEE Main202623 January 2026Morning ShiftPhysicsElectrostaticsActual

Two point charges 2 q and q are placed at vertex A and centre of face C D E F of the cube as shown in figure. The electric flux passing through the cube is :

Options

  1. A3 q 2 ₀
  2. B3 q 4 ₀
  3. Cq ₀
  4. D3 q ₀

Correct answer

B. 3 q 4 ₀

Step-by-step solution

Using Gauss's law: = Q_ in ₀ Charge 2q is at vertex A of the cube. A vertex is shared by 8 cubes, so the flux contribution from 2q through this cube is 2q 8 ₀ = q 4 ₀ . Charge q is at the centre of face CDEF. A face center is shared by 2 cubes, so the flux contribution from q through this cube is q 2 ₀ . Total flux: = q/4 + q/2 ₀ = 3q 4 ₀

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