Physics - Electrostatics Notes
1. What is Electrostatics?
Electrostatics is the study of electric charges at rest. It deals with the forces, fields, and potentials arising from
static charges.
2. Basic Properties of Electric Charge
- Two types: Positive and Negative
- Like charges repel, unlike charges attract
- Charge is conserved and quantized
- SI unit: Coulomb (C)
3. Coulombs Law
The force between two point charges is directly proportional to the product of their charges and inversely
proportional to the square of the distance between them.
Formula: F = k * (q1 * q2) / r^2
4. Electric Field and Electric Field Lines
- Electric Field (E) is the force per unit positive charge.
E=F/q
- Field lines indicate direction and strength of the electric field.
- Lines never intersect and point away from positive, toward negative.
5. Electric Potential
Electric potential (V) at a point is the work done in bringing a unit positive charge from infinity to that point.
V=k*q/r
6. Gausss Law
The total electric flux through a closed surface is equal to 1/ times the net charge enclosed by the surface.
=q/
7. Applications of Electrostatics
- Capacitors and energy storage
- Photocopiers and printers
- Air purifiers and electrostatic precipitators
1. What is Electrostatics?
Electrostatics is the study of electric charges at rest. It deals with the forces, fields, and potentials arising from
static charges.
2. Basic Properties of Electric Charge
- Two types: Positive and Negative
- Like charges repel, unlike charges attract
- Charge is conserved and quantized
- SI unit: Coulomb (C)
3. Coulombs Law
The force between two point charges is directly proportional to the product of their charges and inversely
proportional to the square of the distance between them.
Formula: F = k * (q1 * q2) / r^2
4. Electric Field and Electric Field Lines
- Electric Field (E) is the force per unit positive charge.
E=F/q
- Field lines indicate direction and strength of the electric field.
- Lines never intersect and point away from positive, toward negative.
5. Electric Potential
Electric potential (V) at a point is the work done in bringing a unit positive charge from infinity to that point.
V=k*q/r
6. Gausss Law
The total electric flux through a closed surface is equal to 1/ times the net charge enclosed by the surface.
=q/
7. Applications of Electrostatics
- Capacitors and energy storage
- Photocopiers and printers
- Air purifiers and electrostatic precipitators
