Topic 12: magnetism and the motor effect

Created by

Mollie

Cards (22)

what poles repel?
Like (south south and north north)
what poles attract?
opposite poles
what are the four magnetic materials?
colbalt, steel, iron and nickel
how are temporary magnets made
by ‘stroking’ them with a permanent magnet so that all the domains align in the same direction
where is the magnetic field strongest on a diagram
where the field lines are closest
what do plotting compasses do
show the direction and shape of a magnetic field at many given point
What does magnetically soft mean
It magnetises and demagnetises fast
what does magnetically hard mean
it retains its magnetism
what is a permanent magnet
made from magnetically hard materials and always has its own magnetic field
what is an induced magnet
only magnetic within a magnetic field and is made from magnetically soft materials
what can induced magnets only do
attract permanent magnets not repel
what are the four thing you need you know about magnetic field lines
go from north to south
the closer together the stronger
field is stronger at the poles
uniform field - when two opposite poles are placed together the lines are parallel and equally spaced
Which way do compasses point on Earth
Magnetic north geographical south
how is the magnetic field around a long straight conductor
in a circle around the wire
how do you find the direction of the field and current around a wire
the right hand rule:
thumb is the direction of the current
fingers are the direction of the magnetic field
how do the closeness and current affect the strength of the field
higher current stronger field
closer the lines stronger the field
how do the coils in a solenoid add to form a uniform field
the loops add together to form a uniform field along the centre of the solenoid
why is the field outside the solenoid weaker
the fields cancel out
what force does a carrying conductor experience
equal and opposite - newtons 3rd
why do magnetic forces happen because of interactions in magnetic fields
a force is created when two magnetic fields interact one from the wire and one from the magnet
when is the force strongest
when the wire is perpendicular to the magnetic field
what is the left hand rule
thumb is direction of the force
first finger is the direction of the field
second finger is the direction of the current