Magnetism & electromagnetism (p2)

Magnet

Any material/ object that produces a magnetic field

What do field lines show and their directions

Shows:

• if attracts or repels

• Strength of a magnet at a particular point

How do you find poles and field lines

Interaction between two magnets: repel

Interaction between two magnets: attract

Magnetic material

Magnetic elements

Permanent magnets vs induced magnets

Magnetically soft materials vs magnetically hard materials

Soft- materials that lose their magnetism really quickly = nickel & iron

Hard- materials that lose their magnetism really slowly= steel

How to use right hand rule on a straight wire

How do field lines work on a circular coil

Magnetic fields in and out of a solenoid

How to increase strength of a solenoid

What is the motor effect and how to create a full force

To create full force wire needs to be 90 degrees (parallel) to the magnetic field

If wire is at slight angle- Less force

Wire is same direction to magnetic field- no force

How do you find direction of force

Left hand rule in a horseshoe magnet

How does electric motor work

How to fix the electric motor from going back and forth and just going in one direction

Use split ring commutator

How to increase speed of rotation in a split ring commutator