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phys: correct coulomb constant unit

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eggy 2021-02-09 20:28:12 -05:00
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@ -873,7 +873,7 @@ Charges are expressed in **Coulombs** ($\text{C}$) with the symbol $q$. One elec
Similar to gravitation, the forces between charges is proportional to their charges and inversely proportional to the square of the distance between them.
$$F_E \propto q_1q_2 \propto \frac{1}{r^2}$$
The equation that describes the force between charges is as follows, where $k$ is a constant with the value $8.99×10^9\text{ m}^{-2}\text{C}^{-2}$:
The equation that describes the force between charges is as follows, where $k$ is a constant with the value $8.99×10^9\text{ N m}^{2}\text{C}^{-2}$:
$$F_E = \frac{kq_1q_2}{r^2}$$
The **electrical permittivity**, $\epsilon$, of a material is its resistance in creating an electric field in it, and has the units $\text{farad}\cdot\text{m}^{-1}$. Free space/a vaccum has a permittivity of $1$ and its value is known as $\epsilon_0$.