Answer: q/(24 0 ).
- A q/(24ε<sub>0</sub>)
- B q/(8ε<sub>0</sub>)
- C q/(12ε<sub>0</sub>)
- D q/(6ε<sub>0</sub>)
Correct answer: A. q/(24ε<sub>0</sub>)
Explanation: Eight identical cubes can be joined with the charge at the common centre, giving total flux q/ε<sub>0</sub>. Each cube gets q/(8ε<sub>0</sub>), shared equally among its three outer faces, giving q/(24ε<sub>0</sub>) 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.