Flashcards in 12 Deck (22)
What can magnets be made from?
What are the two ends of magnets called?
North and south.
Opposites do what?
2 norths, or two souths do what?
What type of force is magnetism?
Non contact force.
What is a magnetic field?
An area around a magnet were magnetic objects feel a force.
How can you find out the shape of a magnetic field?
By using iron filings.
What is a permanent magnet?
A magnet which is a magnet all the time.
What is a induced magnet?
A magnetic material which is a magnet only when inside a magnetic field.
Parallel lines were each all lines are the same and have equal force apron them.
A bar magnet:
-a non-uniform magnet. With weird lines, (see book)
2 strange things about the earths magnetic field:
- the top of the earth is south and the bottom is north.
- the magnetic field doesn’t exactly hit the poles.
What factors effect the magnetic strength?
- number of turns on the coil.
- current in the wire.
- material of the core.
How do you increase the reliability?
- repeat the experiment and find the mean result.
- increase the range of the data using smaller intervals.
Right hand thumb rule shows what?
It shows were the magnetic field around the wire is.
How to use the right hand thumb rule.
-Hand into a claw type position.
- point thumb in the same direction as the current.
- then fingers show the direction of the magnetic field.
What is a motor effect?
Where a force is produced when a current flows inside a magnetic field.
What is a solenoid?
A coil of wire with a current going through it.
Where is the current strongest in a solenoid?
In the middle as all field lines go the same way, so the force is stronger there. (To understand draw out diagram and use right hand rule.)
What does the Fleming left hand rule show?
It shows were the force would push or pull an object.
What do the fingers represent in the Fleming left hand rule?
Thumb - force
1st finger - magnetic field attraction lines direction.
2nd finger - direction of current.