Physics 1E03

Name	Symbol	Unit
charge		$C$ $1C=10^{-6}\mu C$
smallest unit of charge	$e=+1.602\times10^{-19}C$	$C$
coulomb's constant	$k_e=8.988\times10^9\frac{N\cdot m^2}{C^2}$	$\frac{N\cdot m^2}{C^2}$
electric field	$\vec{E}$	$N/C$
unit vector in the direction of $r$	$\hat{r}$
dipole moment (direction is from the negative charge to the positive charge)	$\vec{p}$

Particle	Charge (C)	Mass (kg)
Electron (e)	$-1.602\times10^{-19}$	$9.109\times 10^{-31}$
Proton (p)	$+1.602\times10^{-19}$	$1.673\times 10^{-27}$
Neutron (n)	$0$	$1.675\times 10^{-27}$

Equation	Explain
$\vec{F}=k_e\frac{q_1q_2}{r^2}\hat{r}$	coulomb's law, force between two charges
$\vec{F}=\vec{E}\cdot q_0$	$\vec{F}$: force on charge $q_0$ in electric field
$\vec{E}=k_e\frac{q}{r^2}\hat{r}$	$\hat{E}$: electric field produced by a charge
$\vec{a}=\frac{q}{m}\vec{E}$	acceleration of a particle in a electric field

Charge is conserved

Electric dipole

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Last update: February 5, 2022
Created: January 12, 2022