electromagnetism Flashcards
in a magnet, where do field lines leave and enter
leave north, enter the south
unlike gravity fields or electric fields, electromagnetic fields are …
continuous circles
force strength of an electromagnetic field is F =
Bil (B= magnetic field, i=current, l=length)
the test charge or test mass equivalent for EM is
1 Amp through 1m of wire
what is the motor effect?
an electric current (voltage) produces a magnetic field that causes other magnets to move (volt-> KE)
what is the generator effect?
a spinning magnet produces a changing magnetic field that induces a voltage on another set of coils (KE -> Volt)
what is Lenz’s law
any EM effect induces a change that attempts to counter its origin. (motors counter generators and visa versa) (negative feedback loop)
