physics Flashcards
what is charge
a fundamental property of many subatomic particles. electrons, by conversion have a negetive charge is the columb (C) and the symbol isQ
what is an electronic current
a flow of electrons
equation for current and charge
Q = I x T
Q is columbs I is amps and t is seconds
what is a pernament magnet
produces its own magnetic field
what is an induced magnet
an object which can become a magnet when it is placed in a manetic field.
magnetic materials
Iron, steel, nickel and cobalt
describe the strength of the magnetic field
magnetic flux density
what is it called when the magnetic field by a current flowing through a wire can be used to make magnets that can be switched on or off.
electromagnets
what is a solenoid
is created by wrapping wire into a coil. this increases the magnetic flux density of the magnetic field when a current passes through the coil of the wire
does the current get stronger or weaker with the magnetic flux line which are closer together
stronger.
what is a porative electromagnet
desgined to hold material in place
a tractive electromagnet
one that applies a force to moves other object.
what us a generator effect
when a potenital difference voltage is measured in a wire
what are longitudinal waves
transfer energy perpandicular
