Question

What are the dimensions of K (coulomb’s law constant)?

• A. $\frac{N{m}^2}{C^2}$
• B. $\frac{N{C}^2}{m^2}$
• C. $\frac{Nm}{C^2}$
• D. $\frac{NC}{m^2}$

Answer 1

The correct option is A

$\frac{N{m}^2}{C^2}$

$F=\frac{K{q}_1{q}_2}{r^2}$

$K=\frac{F{r}^2}{q_1{q}_2}=\frac{N{m}^2}{C^2}$