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

---

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