A point charge Q is placed at the center of a cube. What is the electric flux th

Practice Questions

Q1
A point charge Q is placed at the center of a cube. What is the electric flux through one face of the cube?
  1. Q/ε₀
  2. Q/6ε₀
  3. Q/4ε₀
  4. 0

Questions & Step-by-Step Solutions

A point charge Q is placed at the center of a cube. What is the electric flux through one face of the cube?
  • Step 1: Understand that electric flux is related to the charge inside a closed surface.
  • Step 2: Recognize that the cube has 6 faces and the point charge Q is at the center.
  • Step 3: Use Gauss's Law, which states that the total electric flux (Φ) through a closed surface is equal to the charge (Q) enclosed divided by the permittivity of free space (ε₀).
  • Step 4: Calculate the total electric flux through the entire cube: Φ_total = Q / ε₀.
  • Step 5: Since the cube has 6 identical faces, the electric flux through one face is the total flux divided by 6.
  • Step 6: Therefore, the electric flux through one face of the cube is Φ_face = Q / (6ε₀).
  • Gauss's Law – The total electric flux through a closed surface is proportional to the charge enclosed within that surface.
  • Symmetry in Electric Fields – The uniform distribution of electric flux across symmetrical surfaces, such as the faces of a cube.
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