07. Static Electricity and Capacitance

– : It has gained electrons
+ : It has lost electrons

A substance through which electric charge cannot flow

A substance through which electric charge can flow

*Silver, Copper, Aluminium
Water
Human Body, The Ground

*Glass
Plastic
Rubber
Air

*6.25 × 10¹⁸
1 ÷ (electronic charge, log tables)

*on the outside
it gathers where the conductor is most pointed

States that the force of attraction or repulsion between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

1 Coulomb of charge passes a particular point when 1 A of current flows for 1 second

*check*

*
ε= εr × ε0
medium = relative permittivity × vaccuum

any region of space where electric forces can be felt

*An electric field is always caused by other static charges in the vicinity.

*a line drawn in an electric field showing the direction of the force on a positive charge placed in the field.

**check asterisk**

The electric field strength at a point is the force per unit charge at that point

*N / C = V / m

The work done per unit charge moved between two points.

The potential difference between two points is 1 volt if 1 J of work is done in bringing 1 C from one point to the other

a flow of electric charge

The potential difference between a point and the Earth

Charge per unit voltage

A conductor has a capacitance of 1 farad if placing a charge if 1 C on it raises its potential by 1 V

*Camera flash gun
Smooth out variations in direct current

*Charge vs Mass
Attraction & Repulsion vs Only Attraction