Answer: independent of distance.
- A independent of distance
- B directly proportional to r
- C proportional to 1/r² only
- D always exactly zero
Correct answer: A. independent of distance
Explanation: For an infinite sheet, E = σ/2ε₀, the same at all distances.
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.