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Question

A charge is placed at the centre of a cube. The electric flux through one face of the cube is :
  1. Zero
  2. Qε0
  3. Q6ε0
  4. Q4ε0

A
Q4ε0
B
Q6ε0
C
Qε0
D
Zero
Solution
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As the charge at the center of the cube, the flux through each surface is same. Using Gauss's law, 6ϕ=Qϵ0ϕ=Q6ϵ0

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