Introduction

Question 1

What is Electromagnetism?

Answer 1

It is the study of electric charges, at rest and moving and what effects they make, such as electric fields and magnetic fields.
It is to understand quantities such as charges and fields

Question 2

What is a field?

Answer 2

A field is a region in which each point has a physical quantity associated with it.
Vector field has each point being a vector.

Question 3

What is a the quantities in EM?

Answer 3

Sources and fields

Question 4

What are the four fundamental vector fields?

Answer 4

E electric field intensity [V/m], D electric flux density (Electric displacement) [C/m2], B magnetic flux density [T] and H magnetic field intensity [A/m].

Question 5

Where are they used for?

Answer 5

E is used in electrostatics (effects of stationary electric charges) and vacuum and D is used in materials, such as dielectric.
B is magnetostatics (effects of steady electric currents) and vacuum and H is used in materials

Question 6

What are the four fundamental SI units in EM?

Answer 6

Kilogram [kg], Ampere [A], length [m] ,time [s]

Question 7

What is a electric charge?

Answer 7

Fundamental property of matter and exists only as positive or negative

Question 8

What is conservation of charge?

Answer 8

It is a principle that charges cannot be made are destroyed, just like conservation of energy.

Question 9

What is volume charge density?

Answer 9

Is a smoothed-out function where very small volume that is still large enough to contain a very large number of discrete charges.