**Column I**(A) Coulomb's lawn(B) Surface charge density (C) Quantisation of charge (D) Electric flux
**Column II**(P) Charge/Area (Q) \( \oint \vec{E} \cdot d\vec{s} \) (R) \( q = ne \) (S) Force is inversely proportional to square of distance
Solution:
Coulomb's law is an inverse square law (A-S). Surface charge density is charge per unit area (B-P). Charge is quantised as \( q=ne \) (C-R). Electric flux is defined by Gauss's integral (D-Q).
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