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PreAP Electromagnetism

PreAP Electromagnetism. Magnetic Force in a Wire. Since a wire is moving current if it is in a magnetic field there will be a force that can be determined using F = ILB sin θ. Magnetic Field by a wire. A current carrying wire also produces a magnetic field. Right Hand Rule #2.

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PreAP Electromagnetism

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  1. PreAP Electromagnetism

  2. Magnetic Force in a Wire Since a wire is moving current if it is in a magnetic field there will be a force that can be determined using F = ILB sinθ

  3. Magnetic Field by a wire A current carrying wire also produces a magnetic field

  4. Right Hand Rule #2 • For Current in a wire • Thumb = Current • Fingertips = Magnetic Field

  5. Magnetic Field in a Wire Strength decreases as you get further from the wire B = u0I / 2πr

  6. Loops of Wire When a wire is looped the change in the wire changes the magnetic field B = N u0I / 2r

  7. Solenoids Long coils of wire in loops similar to DNA helixes B = u0nI Creates electromagnets

  8. Electromagnetism Electricity and magnetism are linked where electricity can create magnetic fields and vice versa

  9. Induced Current & EMF A current that is made when a magnet approaches a coiled wire

  10. Motional EMF Induced EMF caused by the motion of a charged particle through a magnetic field E = vBL

  11. Magnetic Flux Defined as the strength of a magnetic field multiplied by the area in which it acts Φ = BA E = ΔΦ/ Δt

  12. Faraday’s Law Change in flux for each loop has an affect on EMF induced E = -N(ΔΦ/ Δt)

  13. Generators A generator uses physical work to rotate magnets and create and EMF

  14. Motors Use electricity to create physical work using magnetic force

  15. Transformers A device used to increase or decrease the EMF in an AC circuit Vs / Vp = Np / Ns Stepping up EMF reduces current and vice versa

  16. Power Grid

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