Magnetism
- Created by: hufflepuffler
- Created on: 01-04-19 14:02
View mindmap
- magnetism
- basics
- like poles repel
- three magnetic elements are iron, cobalt and nickel
- not all metals are magnetic
- opposite poles will attract
- when a current flows along a wire, a magnetic field is produced
- right hand grip rule
- thumb points in the direction that the current is going and your fingers show the direction of the magnetic field
- induced magnetism
- when an iron nail or steel paperclip is in the magnetic field of a bar magnet it creates its own magnetic field
- how to increase the strength of electromagnets
- increase the number of turns of wire
- increase the current
- motor effect
- the current in the wire produces a magnetic field which interacts with the magnetic field of the magnet producing a force
- the force is strongest when the magnetic field is perpendicular to the current
- the force is zero when the magnetic field and the current are parallel
- ways of increasing the force in the motor effect
- increasing the strength of the magnetic field
- increasing the size of the current
- the force can be made to act in the opposite direction by:
- reversing the current
- reversing the magnetic field
- Flemings left hand rule
- current goes from positive to negative
- second finger= current
- first finger= magnetic field
- thumb= force
- basics
Comments
No comments have yet been made