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JAMB Physics 2001 Question 30

Question 30

Electrostatics

The diagram above shows a closed square box of side 0.5 m in a uniform electric field E in the direction shown by the arrows. What is the flux ϕ for the box?

Diagram for this question
  1. A.0.5 E
  2. B.2.0 E
  3. C.0.2 E
  4. D.0.0 E
Show the answer and explanation

Answer: D (0.0 E)

Explanation

In a uniform field every field line that enters the closed box also leaves it, so the flux in equals the flux out and the net flux is zero.