Notes on The Magnetic Force on a Moving Charge | PHY 212, Study notes of Physics

Material Type: Notes; Class: General Physics II; Subject: Physics; University: Syracuse University; Term: Unknown 2008;

Typology: Study notes

Pre 2010

Uploaded on 08/09/2009

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Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Lecture 12.1
1.How magnetic field influence moving charge
1.Point charge
2.Current carrying wire
3.Current loops and magnet
2.Magnetic properties of matters
1.Spins and atomic magnetic moment
2.Paramagnetism, diamagnetism,
ferromagnetism, and superconductivity
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Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.

Lecture 12.

  1. How magnetic field influence moving charge  Point charge

Current carrying wire

Current loops and magnet

  1. Magnetic properties of matters  Spins and atomic magnetic moment

ferromagnetism, and superconductivityParamagnetism, diamagnetism,

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.

The Magnetic Force on a Moving Charge

The magnetic force on a charge

(^) q

field as it moves through a magnetic

B

(^) with velocity

(^) v (^) is

where

is the angle between

v

and

B

force:Compare with electrostatic (Coulomb)

( Lorentz Force )

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.

Several Special Cases of Lorentz Force

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.

How charge move in a uniform magnetic field

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.

Force between two parallel wires

Two parallel current attract

Two antiparallel currents repel

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.

http://www.viddler.com/explore/oliveroverwood/videos/21/

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.

Magnetic properties of atoms

  •  magnetic dipole momentsElectrons move around nucleus, current loop,
  •  moment: SpinElectrons also have intrinsic magnetic dipole
  •  integer multiple of a fundamental unitMagnetic moment of any atom must be
  •  macroscopic moment (Ferromagnetism)point to a common direction and form aeach other (para-magnetism), they may alsomoments may orient randomly and cancelIn macroscopic matters, these small magnetic

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.

Paramagnetism

weakly attracted by magnetsParamagnetic materials are