Download Unit 2

Mr. Fleming
D4. Explain the relationship among voltage,
current and resistance in a simple series
circuit.
D5. Explain how electricity is used to produce
heat and light in incandescent bulbs and
heating elements.
D6. Describe the relationship between current
and magnetism.

What is a magnet?

How does an object become magnitized?

Magnetism
◦ The attraction of a magnet for another object.
◦ Discover 1,000s of years ago and referred to as
lodestones.
◦ Certain part of lodestone or northern pole would
always point to northern star called leading star

Magnetic Poles
◦ A pole is an area of magnet where the magnetic
effect is strongest.
◦ Two Poles
 North
 South

Interactions between Magnetic Poles
◦ North + South= Magnets Attract
◦ North + North= Magnets Repel
◦ South + South= Magnets Repel

Magnetism
◦ The force of attraction or repulsion between
magnetic poles.

Magnetic Field
◦ The region of magnetic force around each magnet
◦ Magnetic Lines
 Map out the magnetic fields around magnet.
 Spread out from one pole, curve around magnet, and
return to other pole.

Electron Spin
◦ The magnetic properties of a material depend on
the structure of its atoms.
◦ Electrons are the particle that causes magnetism.
 Electrons spin as they orbit the nucleus.
 Moving electron produces magnetic field

Magnetic Domain
◦ Clusters of billions of atoms that all have magnetic
fields that are lined up in the same way.
◦ In a magnetized material all or most of the domains
are arranged in the same direction.
◦ Domains are represented by arrows.

Ferromagnetic Material
◦ A material that makes a good magnet.
◦ Iron, Nickel, Cobalt

Making Magnets
◦ Place non-magnet near magnetic material.

Destroying Magnets
◦ Drop, strike it hard, or heat it up.
◦ Domains knocked out of alignment.

Breaking Magnets
◦ One broken magnet= two smaller magnets

What is a magnet?
A. Makes picking up paper clips easier.
B. An object that has domains that are out of
alignment.
C. An object that only has one pole.
D. An object that has two poles, and can attract
other magnetic materials.
D. An object that has two poles, and can attract other
magnetic materials.

How does an object become magnetized?
A.
B.
C.
D.

It’s domains become misaligned.
It’s domains become aligned in same direction.
It needs to absorb more electrons.
It needs to have a stronger south pole than north
pole.
B. It’s domains become aligned in same direction.