Magnetism and Electromagnetism 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 which 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?
material that produces its own magnetic field
What is an induced magnet?
material that becomes magnetic when it is put in a magnetic field
What does a magnetic compass contain?
Small bar magnet
What is produced around a wire when an electric current flows through it?
magnetic field
What factors does the strength of the magnetic field around a straight wire depend upon?
size of current, distance from wire
What effect does shaping the wire into a solenoid have on the magnetic field strength?
increases strength of magnetic field
How can the strength of the magnetic field inside a solenoid 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)
