Magnets and Electromagnets Flashcards
What is a magnetic field
the region of space around a magnet where a magnetic material will experience a force
what happens when like and unlike poles are brought together
like=repel
unlike=attract
what happens to the strength of the magnetic field as you get further away from the magnet
decreases
where is the magnetic field of a magnet strongest
at the poles
in what direction do magnetic field lines always point
north to south
what does the distance between magnetic field lines indicate
strength of the field, closer together=stronger field
what is a permanent magnet
a material that produces its own magnetic field
what is an induced magnet
a material that becomes magnetic when it is put in a magnetic field
what does a magnetic compass contain
a small bar magnet
what factors does the strength of the magnetic field around a straight wire depend upon
size of current, distance from the wire
what effect does shaping the wire into a solenoid (coil) have on the magnetic field strength
increases strength of magnetic field
how can the strength of the magnetic field inside a solenoid (coil) be increased
put an iron core inside
what does Fleming’s left-hand rule show
relative orientation of the force, current in the conductor, and magnetic field for the motor effect
what is the symbol for magnetic flux density and what unit is it measured in
B, tesla (t)
what is the motor effect
when a conductor placed in a magnetic field experiences a force
