P13- Magnets And Electromagnets Flashcards
What is a magnetic field?
The region of space around a magnet where material will experience a force
What happens when like and unlike poles are put together
Like= repel
Unlike=attract
What happens to the strength of a magnetic field as you get further from a magnet?
Decreases
Where is the magnetic field of a magnet stronger?
At the poles
Which way do magnetic field likes always point?
N-S
What does the distance between magnetic field lines indicate?
The strength of the magnetic field
What is a permanent magnet?
A magnet that produces its own magnetic field
What is an induced magnet?
Material that becomes magnetic when it is in another magnetic field
What is produced around a wire when there is a current running through it?
A magnetic field
What factors influence the strength of a magnetic field around a straight wire?
Distance from the wire, current
What does shaping the wire into a solenoid do?
Increases the strength
How can a solenoid be made stronger?
Put an iron core inside
What metals are magnetic (Caiden theory)
Cobalt, iron, nickel
What does Flemings left hand rule show?
Thumb- motion
Finger- force
Second finger- current
What is the motor effect?
When a conductor placed inside a magnetic field experiences a force
