P4 Magnets and Magnetic Field
- Created by: Sagaana
- Created on: 02-05-18 13:45
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- P4 Magnets and Magnetic Field
- Magnets and magnetic fields
- Magnets have a north pole and a south pole
- They have magnetic field lines they closer they are the stronger the Magnetic flux density
- You can see magnetic field line using compasses or iron filling (compasses all ways point north thus shows that the earth have a magnetic field
- like pole repel and opposite poles attracts.
- Electromagnetism
- A current caring wire has a Magnetic field around it
- If you have a lot of Solenoids together the magnetic effect increases
- You can increase the magnetic effects of a solenoid:-current increased -the number of turns -the length of the solenoid-and adding a magnetic Core inside.
- Magnetic Forces
- When two magnetic fields affect one another . the result is a force.To experience full force the wire has to be 90 degrees to the magnetic field
- Flemmings lefts hand Rule
- Thumb: Motion
- First Finger: Magnetic field
- Second Finger: Current
- Force= Magnetic Flux density x Current x Length
- Motors
- Current Increases so stronger Field and increases wire.which make the coil spin faster.
- Split ring commutator keeps it spinning one way.
- loudspeakers
- Changing current in coil.the force on coil.The cone moves and the sound is made.
- Electromagnetic induction
- if you have circuit flow you can make electromagnets. this electromagnet has a field.The field opposes the motion.The moving wire and magnet will produce a P.D
- Altenator
- produce a a.c current and uses slip rings
- Dynamo
- Produce ad.c current and uses split rings
- Transformers
- they change the size of the potential difference.
- they have two coils the primary and secondary.
- an Iron is a magnetic material and the core becomes magnetised and it will
- the changing magnetic field means that it will induce a p.d
- Step-up transformer and step-down transformer
- Magnets and magnetic fields
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