Practice question

**Coulomb's law** gives force between point charges as F = k·|q₁q₂|/r², k = 1/(4π ε₀) = 9×10⁹ N·m²/C², directed along line joining charges. Like charges repel, opposite attract, magnitude scales with product of charges and inverse square of separation r². The positive charge generates a repulsive force on a positive test charge, as per Coulomb’s law. Due to the spherical symmetry of a point charge, the field is directed radially outward, reflecting the repulsion and symmetry of the charge distribution. Substituting values gives Repulsion, which matches expected magnitude for this electrostatic configuration, confirming Coulomb's and Gauss's principles and charge quantization consistency.