magnetism Flashcards
1
Q
magnetic metals
A
iron
steel
cobalt
nickel
1
Q
induced magnetism
A
when a non magnetic material is magnetized
2
Q
what causes loss of magnetism
A
hammering causes atoms to become disorganized
- heating to high temperature
- placing magnet in a coil + passing an alternating current through
3
Q
what is magnetic field
A
a moving electric charge within which the force of magnetism acts
4
Q
right hand rule
A
direction of north pole
thumb - motion
pointer - field
current - middle
5
Q
how to increase magnetic field of a solenoid
A
- add more turns to the coil
- increase the current
- add an iron ore
6
Q
pattern of a magnetic field around a straight wire
A
- it is perpendicular to the wire at all points
- circular
- right hand grip rule direction of field
- strongest closest to the wire
7
Q
what is the effect on the magnetic field of changing the direction of current
A
- change in direction of current will reverse the magnetic field
8
Q
a motor
A
a piece of wire that spins
9
Q
motor effect
A
wire will start spinning to make a simple motor only if you have a coiled wire
10
Q
transformer equation
A
vp/vs = np/ns
