magnets Flashcards
(16 cards)
Were are magnetic forces strongest at?
at the poles
Two like poles…
repel
Two opposite poles…
attract
What type of forces are repel and attract?
non contact forces
What does a permanent magnet do?
produces it’s own magnetic field.
What does an induced magnet do?
a material that becomes a magnet once placed in a magnetic field.
What are the four magnetic materials?
iron
steel
cobalt
nickel
What is a magnetic field?
a region around the magnet where the force acts on another magnet or magnetic material
How can the direction of magnetic field be found?
a compass
How can we increase the strength of the magnetic field?
coiled wire –> increase the turns
increase the current
iron inside the solenoid (iron core)
What is a coiled wire called?
solenoid
What is the equation that links force,
magnetic flux density and length?
force = magnetic flux density × current × length
What is the unit for force?
N
What is the unit for magnetic flux density?
T
What is the unit for current?
A
What is the unit for length?
m
