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Magnets and Magnetic Fields

Magnets and Magnetic Fields. Ch 21.1. Magnetic Forces. The force a magnet exerts on Another magnet Iron or similar metal Moving charges Magnetic Fields Region where force is strongest North and South. Magnetic Fields. Surrounds a magnet and exerts a magnetic force

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Magnets and Magnetic Fields

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  1. Magnets and Magnetic Fields Ch 21.1

  2. Magnetic Forces • The force a magnet exerts on • Another magnet • Iron or similar metal • Moving charges • Magnetic Fields • Region where force is strongest • North and South

  3. Magnetic Fields • Surrounds a magnet and exerts a magnetic force • Strongest near the poles • Attracts or repels other magnets

  4. Magnetic Fields Around Magnets Around Earth • Earth is giant magnet • Magnetosphere

  5. Magnetic Materials • Magnetic Domains • Large # of atoms • Aligned magnetic fields • Ferromagnetic Materials • Can be magnetized due to domains

  6. Magnetic Materials Nonmagnetized Magnetized • Domains arranged randomly • Domains arranged in an order

  7. Electromagnetism Ch. 21.2

  8. Electricity and Magnetism • Electromagnetic Force • Electric force = charged particles • Magnetic force = movement of electrons

  9. Electricity and Magnetism MF Around Moving Charges Forces Acting on Moving Charges • Moving electric fields create a magnetic fields • Charge will be deflected in a direction perpendicular to the magnetic field and velocity of charge

  10. Solenoids and Electromagnets • Solenoid • Coil of current carrying wire that produces a magnetic field • Electromagnet • Solenoid with a ferromagnetic core • Changing the current in an electromagnet controls the strength and direction of its magnetic field

  11. Electromagnetic Devices • Change electrical energy into mechanical energy • 1. Galvanometer • Uses solenoid • 2. Electric Motors • Uses electromagnets • 3. Loudspeakers • Uses solenoid

  12. Electrical Energy Generation and Transmission Ch 21.3

  13. Generating Electric Current • Electromagnetic Induction • Generating current by moving an electrical conductor relative to a magnetic field • Discovered by Faraday • Voltage is induced in a conductor by a changing magnetic field

  14. Generator • Device converts mechanical energy into electrical by rotating a coil of wire in a magnetic field

  15. Generators AC DC • Produces alternating current • Produces direct current

  16. Transformers • Device that increases or decreases voltage and current of 2 linked AC circuits • Changes the magnetic field in 1 coil then induces an AC current in a nearby coil with a different # of turns

  17. Transformers Step Down Step Up • Decreases voltage and current • Increases voltage • Decreases current

  18. Energy in your Home • Generated by coal, water, nuclear, wind natural gas, and petroleum • Turbines • Fanlike blades that turn when pushed

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