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Announcements

Announcements. Homework for tomorrow… (Ch. 32, Probs. 16, 18, & 27) 32.4: a) –(3.2 x 10 -15 T) jhat b) 0 c) (1.0 x 10 -15 T) ihat 32.6: (2.8 x 10 -17 T) khat Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am Tutorial Learning Center (TLC) hours:

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Announcements

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  1. Announcements • Homework for tomorrow… (Ch. 32, Probs. 16, 18, & 27) 32.4: a) –(3.2 x 10-15 T) jhat b) 0 c) (1.0 x 10-15 T) ihat 32.6: (2.8 x 10-17 T) khat • Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am • Tutorial Learning Center (TLC) hours: M 8-1 pm, 3-6 pm, W 8-1 pm, 2-6 pm TR 8-6 pm, F 8-2 pm

  2. Chapter 32 The Magnetic Field (Magnetic Dipoles & The Magnetic Force on a Moving Charge)

  3. Review… The B-field of a current loop of radius R carrying a current I… The B-field of a coil of radius R with N turns carrying a current I…

  4. Electric dipole moment, revisited… • Electric dipole moment • E-field of a dipole on the dipoleaxis Notice: zis distance measured from the center of dipole. +q s -q

  5. 32.5: Magnetic Dipoles The B-field of a current loop… Notice: This field has rotational symmetry

  6. 32.5: Magnetic Dipoles The B-field of a magnetic dipole moment is…

  7. 32.5: Magnetic Dipoles The B-field of a magnetic dipole moment is… Notice: This result is valid on axis of dipole, when z >> R! where

  8. Comparing the Electric dipole moment to Magnetic dipole moment… The E-field of an electric dipole moment is… The B-field of a magnetic dipole moment is… +q s -q

  9. Quiz Question 1 What is the current direction in the loop? • Out at the top, in at the bottom. • In at the top, out at the bottom. • Either 1. or 2. would cause the current loop and the bar magnet to repel each other.

  10. 32.7: The Magnetic Force on a Moving Charge • After the discovery that electric current produces a magnetic field, Ampère set up two parallel wires that could carry large currents either in the same or opposite direction. • Ampère’s experiment showed that a magnetic field exerts a force on a current!

  11. 32.7: The Magnetic Force on a Moving Charge Ampere’s experiment implied that… a B-field exerts a force on a moving charge! Magnitude: Direction: given by RHR

  12. 32.7: The Magnetic Force on a Moving Charge Several important properties: • Only a moving charge experiences a magnetic force. • There is NO magnetic force on a charge moving parallel/antiparallel to a B-field. • When there is a force, the force is perpendicular to v & B • The force on a negative charge is in the direction opposite to • For a charge moving perpendicular to B, the magnitude of the magnetic force is

  13. Quiz Question 2 The direction of the magnetic force on the proton is • to the right. • to the left. • into the screen. • out of the screen. • The magnetic force is zero.

  14. Quiz Question 3 The direction of the magnetic force on the electron is • upward. • downward. • into the screen. • out of the screen. • The magnetic force is zero.

  15. i.e. 32.10: The magnetic force on an electron A long wire carries a 10 A current from left to right. An electron 1.0 cm above the wire is traveling to the right at a speed of 1.0 x 107 m/s. What are the magnitude and the direction of the magnetic force on the electron?

  16. Quiz Question 4 Which magnetic field causes the observed force?

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