magentism Flashcards
what is magnetically soft
easily magnetised
easily loses magnetism
example of magnetically soft
iron
what’s magnetically hard
difficult to magnetise
doesn’t lose magnetism
example of magnetically hard
steel
what’s a mag field
region around a magnet where a force acts on another magnet
what do mag field lines show
strength and direction
what poles do mag fields travel from
north to south
where is a mag field strongest
at the poles
lines closer together
properties of a uniform mag field
same strength and direction at all points
how to find direction and shape of mag field
place magnet on paper
draw around magnet
plot compasses
mark direction needle pointing
repeat around
how current affects field strength
large current means larger mag field
how distance affects field strength
greater distance from wire
weaker mag field
explain motor effect
wire with current put in mag field
mag field of wire and magnet interact
wire experiences force
how speaker works
alternating current flows in wire
causes mag field
mag fields interact
coil experiences force
moves cone out
current changes direction
pulls cone in
how electric motor works
direct current in coil
cuts mag field
coil experiences force
force spins motor
split ring changes current direction
