Magnets and Electromagnets
- Created by: NlleA
- Created on: 26-09-18 17:32
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- Magnets & Electro-magnets
- Hard & soft magnetism
- Pure iron's a soft magnetic material
- Easy to magnetise but loses magnetism quickly
- Steel's a hard magnetic material
- Harder to magnetise but keeps magnetism
- Pure iron's a soft magnetic material
- Domains
- Heat from a room's sufficient to give domain's energy; this destroys orderly lines, magnetic field will disappear
- Way to lose domain energy/ alignment is to hit it (or similar)
- Impurity atoms make it difficult to magnetise AlNiCo magnets but also locks domains in position once aligned.
- Heat from a room's sufficient to give domain's energy; this destroys orderly lines, magnetic field will disappear
- Current running through a wire
- A current running through wire will produce magnetic field around wire
- Magnetic field around wire depends on strength of current
- A current running through wire will produce magnetic field around wire
- Solenoids (a coiled wire)
- Magnetic field will increase if you turn a straight wire into solenoid
- Field inside solenoid is strong and uniform
- Field around a solenoid is largely the same as a bar magnet
- Ways to make a solenoid stronger:
- Add an iron core in middle of solenoid
- Increase current in electromagnet
- Increase coils of wire
- Turn straight wire into a solenoid
- Magnetic field will increase if you turn a straight wire into solenoid
- Ways to make a solenoid stronger:
- Add an iron core in middle of solenoid
- Increase current in electromagnet
- Increase coils of wire
- Turn straight wire into a solenoid
- Hard & soft magnetism
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