physics paper 2 sparx science Flashcards
On a ray diagram what is the name given to the line drawn at right angles to the interface?
normal line
what is the interface?
the boundary between one medium and another
what type of waves are water waves and sound waves?
water - transverse
sound - longitudinal
what happens to the speed of waves in a more dense medium?
slows down
what alloy is made from iron and carbon?
is it magnet or not?
steel
magnetic
what metals does the earths core contain?
what does it cause the earth to have?
iron and nickel
- causes the earth to have a magnetic field
what do compasses show?
the direction of the magnetic field
describe the magnetic field lines in a uniform magnetic field?
same distance apart and are straight
what is an induced magnet?
a metal that only becomes magnetic when it’s placed in a magnetic field
what 2 things are needed for an electromagnet?
- a current carrying coil of wire
- a magnetic metal
why is the field very strong along the centre of the solenoid?
the fields from the individual coils add together
why is the field weak outside the solenoid?
the fields from the individual coils cancel
what shape are the magnetic field lines around a current - carrying wire?
circular
describe the field lines inside a solenoid? (2)
equally spaced and straight
what can you do to increase the strength of the magnetic field?
increase the current in the wire
