Physics Final Flashcards
Hans Oersted
a compass needle is deflected by a current carrying a wire
Michael Faraday
moving a magnet near a loop of wire will create a current
Magnetic Field
a moving charge or current creates a B field around it (exerts force on any other moving charges) measured in Tesla
Torque
the loop will feel a twisting force around an axis of rotation
Ampere’s Law
-related the B along a path to the current enclosed by the path
-the sum of all B along those steps is proportional to the current enclosed
Solenoid
a series of loops (helix)
Paramagnetism
materials tend to align with the applied field
Diamagnetism
materials tend to align against the applied field
Ferromagnetism
-when B field is applied, alignment is improved
-when B field is removed, alignment remains
-permanent magnets are ferromagnets
Domains
tend to orient in that direction and grow in size
Faraday/Smith
a relationship exists between magnetism and voltage
Flux
the net amount of electric or magnetic field lines through a surface at a given time
Faraday’s Law
induced EMF in a loop of current is related to the change in flux over time through the loop
Induction
changing the flux through a loop of wire (move a permanent magnet or move/change the current through an electromagnet)
Lenz’s Law
nature abhors a change in flux (a changing flux will induce a current which opposes the change)
