Q. What is the flux through a cube of side a if a point charge of q is at one of its corners?
A) (q/2ε₀)6a²
B) 2q/ε₀
C) q/(8ε₀)
D) q/ε₀
Explanation
[Solution from source] A charge at a corner can be enclosed symmetrically by 8 identical cubes, so each cube receives 1/8 of the total flux q/ε₀, i.e. q/(8ε₀). q/ε₀ would apply only if the charge were inside the cube. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.