Electricity and Magnetism topic 5 (Physics)

What are the electrical charge rules

Like charges repel; opposite charges attract

Electrons are the ones moving/jumping

When moving don’t go very far in the present case

Electrical force: Force of attraction or force of repulsion

What is the imbalance in an object/body due to

excess or deficiency in e- . Innermost e- are held firmly. But superficial ones are easy to remove or shiS (valence electrons). To remove an e- depends on the nature of the material. e- are held firmly in rubber or plasIc than in wool.

What is static electricity

Corresponds to electrical phenomena related to charges at rest (not dynamic electricity). So associated to insulating objects (Isulators)

How do electrons distribute with conductors

Electrons in an ecess distribute at the surface of the object

What are the 3 ways to charge an object

Friction

Conduction

Induction

How does charging with friction work

The electrostatic series (Increasing tendency to gain electrons)

What is a friction example

Between wool and a Plastic rule. Plastic becomes negatively charged

What is charging by induction

Charging without any contact (electroscope) (NO TRANSFER OF e- from one object to another)

What is Coulombs law

Two charged particles nearby at a distance d. Electrical force between them:Fq(N)

What creates and electric field, E

Any fixed charged object 

What does the electric field do?

The electric field stores energy. Electric energy is stored around a fixed charged object and depends on that fixed charge Q expressed in coulombs (C). A fixed charge is called a point charge, Q. Q can be posiIve or negaIve.

Any other charge (q) placed in the electric field (E) will be subjected to

an electrical force (Fq) due to the electric field E

What is this? what does it create

Lines of force from a fixed charged particle:creates an electric field (E)

What does the worldwide convention says about the point charge?

Directopn of the electric field vector= as for a positive “test” charge when in presence of the electric field.

What are field line, or lines of force used to represent

Pictorially the electric field E

More than one particle and their field means what?

E is changing with/ d2

In a particle with and external field what will happen?

In an electric field E, a charged particle q will react.

The charged particle q is subjected to an electrical force