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Electric Charges and Fields — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsElectric Charges and Fields1 Mark
Question
The electrostatic force between two point charges $q_1$​ and $q_2​$ at separation $'r\ '$ is given by $\text{F}=\frac{\text{K}_\text{q1q2}}{\text{r}^2}.$​​ The constant $K:$
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Answer

$\text{K}=\frac{1}{4\pi\epsilon_\circ\text{k}}$ and its units is $N−m^2/ C^2$
It depend on system of unit and dielectric constant $(k),$ that's medium between charges

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