What are the fundamentals of electrostatics?

Electrostatics Fundamentals

Electrostatics is a branch of physics that studies electric charges at rest. Here are some fundamentals you should understand:

• Electric Charge (q): The fundamental property of matter that determines its electromagnetic interaction. It can be positive (protons) or negative (electrons). The elementary charge, denoted by 'e', is approximately $1.6 \times 10^{-19}$ Coulombs.

• Coulomb's Law: This law describes the electrostatic force between two point charges. The force $F$ between two charges $q_1$ and $q_2$ separated by a distance $r$ is given by: $F = k \frac{|q_1 q_2|}{r^2}$ where $k$ is Coulomb's constant, approximately $8.99 \times 10^9$ N m² C⁻².

• Electric Field (E): The electric field is a vector field that describes the electric force per unit charge. It is given by: $\vec{E} = \frac{\vec{F}}{q}$ where $\vec{F}$ is the electric force and $q$ is the test charge. The electric field due to a point charge is: $\vec{E} = k \frac{q}{r^2} \hat{r}$

• Electric Potential (V): Also known as voltage, it is the amount of potential energy per unit charge. The electric potential due to a point charge is: $V = k \frac{q}{r}$ where $k$ is Coulomb's constant, $q$ is the charge, and $r$ is the distance from the charge.

• Electric Dipole: A combination of two equal and opposite charges separated by a small distance. They are important in understanding the electric field and potential around molecules.