Answer: q/(24ε0).
- A q/(24ε0)
- B q/(8ε0)
- C q/(12ε0)
- D q/(6ε0)
Correct answer: A. q/(24ε0)
Explanation: Eight identical cubes can be joined with the charge at the common centre, giving total flux q/ε0. Each cube gets q/(8ε0), shared equally among its three outer faces, giving q/(24ε0) per face.
Field lines always point from positive to negative charge, are denser where the field is stronger, and never cross; an isolated positive charge has lines radiating symmetrically outward, while a dipole's lines curve from the positive to the negative charge.
Concept context
Coulomb's law, electric field, potential, capacitors, Gauss's law.