APHY201 12/5/2015 1 20.6 Force between Two Parallel Wires   Wire #1 has a magnetic field that produces a force on wire #2.

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Presentation transcript:

APHY201 12/5/ Force between Two Parallel Wires   Wire #1 has a magnetic field that produces a force on wire #2

APHY201 12/5/ Solenoids and Electromagnets   The magnetic field of the coil can be increased by adding an iron core.

APHY201 12/5/ Torque on a Current Loop Torque = (Force)(Lever Arm) = NIAB sinθ

APHY201 12/5/ Applications

APHY201 12/5/ Mass Spectrometer   Determine a particle’s mass   Discovery of isotopes

APHY201 12/5/ Ferromagnetism   Magnetic domains: groups of aligned atoms What do they look like?   The motion of electrons in atoms: orbiting and “spinning” Most objects are non-magnetic since the electron motions are cancelled out by other electrons   Magnetic permeability B = B o + B M

APHY201 12/5/ Determine the direction of the force on a positive charge.

APHY201 12/5/ Determine the direction of the velocity on a negative charge.