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Exam 3 Review

Exam 3 Review. Magnetic Fields Faraday’s Law. Magnetic field. Field lines come out of the NORTH end of a bar magnet. Field produced by a wire Field produced by a loop or a coil Field produced by a solenoid. Magnetic Forces on Moving Charges.

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Exam 3 Review

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  1. Exam 3 Review Magnetic Fields Faraday’s Law

  2. Magnetic field • Field lines come out of the NORTH end of a bar magnet. • Field produced by a wire • Field produced by a loop or a coil • Field produced by a solenoid

  3. Magnetic Forces on Moving Charges • Charge q, moving with velocity v in magnetic field B, v makes and angle αwrt B : • Mass spectrometer: v ┴ B, circular path of radius

  4. Magnetic Force on Currents • Current carrying wire perpendicular to B • FWIRE = ILB • Force between parallel wires • Currents in same direction attract, opposite repel

  5. Magnetic torque on dipole • Θ is the angle between the magnetic field B and the perpendicular to the plane of the loop. • Torque on loop is • Loop lies in a plane • No MRI questions

  6. Motional EMF • Straight wire of length L moving perpendicularly to a uniform magnetic field B • EMF = v L B

  7. Magnetic Flux • Θ is the angle between perpendicular to loop and the magnetic field

  8. Lenz’s Law • Current induced in a loop by a changing magnetic flux creates a magnetic field which opposes the change in flux.

  9. Faraday’s Law • Changing magnetic flux induces an EMF: • Lenz’s law gives direction • Faraday’s law gives magnitude:

  10. Flux changes • Change magnetic field • For a coil:

  11. No EM Waves on test

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