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Electric and Magnetic Fields in Physics

Learn how charged particles create electric and magnetic fields in space, the forces they exert, the right-hand rule, uniform circular motion, and the effects of crossed electric and magnetic fields.

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Electric and Magnetic Fields in Physics

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  1. CH 22-2

  2. Review -- how electric and magnetic fields are created Any charged particle creates an electric field at all points in space around it. A moving charged particle creates a magnetic field at certain points in space around it. (B=0 at points along the axis of the velocity of the particle.)

  3. Review -- the force of an electric field on a charged particle

  4. The force of a magnetic field on a charged particle

  5. The force of a magnetic field on a charged particle The magnetic force is perpendicular to BOTH the velocity vector and the magnetic field vector and is given by the right hand rule (for a proton).

  6. Right-hand Rule for Magnetic Force Point your fingers of your right hand in the direction of the velocity so that when you rotate your hand toward the magnetic field; then your thumb points in the direction of the magnetic force on a proton. (The force on an electron is in the opposite direction, or use your left hand.)

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  11. Uniform circular motionof a charged particle in a magnetic field Net force on an object in uniform circular motion has a magnitude

  12. Crossed electric and magnetic fields                                               

  13. Velocity Selector                                               

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