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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. Similar to gravitation, the forces between charges is proportional to their charges and inversely proportional to the square of the distance between them.
$$F_E \propto q_1q_2 \propto \frac{1}{r^2}$$ $$F_E \propto q_1q_2 \propto \frac{1}{r^2}$$
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 $8.99×10^9\text{ N m}^{2}\text{C}^{-2}$:
$$F_E = \frac{kq_1q_2}{r^2}$$ $$F_E = \frac{kq_1q_2}{r^2}$$
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 $\epsilon_0$. 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 $\epsilon_0$.