Fields (1)

Question 1

What are Magnetic Domains or Dipoles?

Answer 1

The smallest known permanent magnetic areas.

• 1mm
• contain millions of aligned unpaired atoms

Question 2

In ferromagnetic materials, magnetic domain are _____ present.

Answer 2

always present, because of the way that atoms bond.

Question 3

How are magnetic domains situated in an unmagnetized state?

Answer 3

randomly organized resulting in net zero magnetism.

Question 4

What happens to magnetic domains when applied with a magnetizing force?

Answer 4

they begin to align, intensifying the parts magnetic field - a magnetic force = the sum of individual domains.

Question 5

Every molecule of matter is a magnet having a ____ and ____ pole.

Answer 5

north and south pole.

Each molecule has its own field of force due to the atomic structure of the molecule.

Question 6

What are Magnetic Lines of Force?

Answer 6

(flux lines or magnetic flux)

hidden lines that explain how magnetic fields behave.

Question 7

What is a Magnetograph?

Answer 7

A graph/diagram used to describe how magnetic lines of force behave by using fine iron fillings on paper placed over a bar magnet.

Question 8

Rules for magnetic lines of force:

Answer 8

• lines never cross
• seek path of least resistance
• densely packed at poles
• flow north -> south outside magnet
• flow south -> north inside magnet
• never leave or enter the center of the magnet

Question 9

Units to measure electro-magnetic force of a magnet

Answer 9

CGS = Maxwell Φ(phi)

SI = Weber

Question 10

Define Flux Density

Answer 10

Number of flux lines per unit area
CGS = Gauss (B)
SI = Tesla