magnetism

Question 1

what creates magnetic dipoles?

Answer 1

charges in motion

Question 2

how to determine the direction of a magnetic dipole

Answer 2

by the direction of movement of the charge
right hand rule

Question 3

where (in relation) are magnetic fields

Answer 3

perpendicular to the motion of charged particles

Question 4

what is Wb

Answer 4

flux
the amount of lines of force

Question 5

what is T

Answer 5

flux density
concentration of lines per area

Question 6

what is a magnetic domain

Answer 6

when several dipoles align

Question 7

what is a diamagnetic material

Answer 7

materials that have no inherent dipoles
slightly repelled by ,agnets

Question 8

give examples of diamagnetic materials

Answer 8

water, plastic, wood

Question 9

what are paramagnetic materials

Answer 9

materials with some inherent dipoles
can be weakly magnetized by an external magnetic field

Question 10

give an examples of a paramagnetic material

Answer 10

gadolinium

Question 11

what are ferromagnetic materials

Answer 11

materials with many inherent dipoles
can become strong magnets

Question 12

give examples of ferromagnetic materials

Answer 12

iron, cobalt

Question 13

what are the 3 ways to create a magnet

Answer 13

interact with a permanent magnet
hammer
run a current through it

Question 14

hard ferromagnetic materials are what

Answer 14

permanent magnets (they keep their dipole alignment)

Question 15

soft ferromagnetic materials create what

Answer 15

electromagnets (only maintain their dipole alignment in a magnetic field

Question 16

what are the 3 ways to destroy magnetism?

Answer 16

heat
hammer
reversing the electrical field

Question 17

what is electromagnetism

Answer 17

creating magnetism from electricity

Question 18

straight wires have a (stronger/weaker) magnetic force

Answer 18

weaker

Question 19

why do coiled wires have higher magnetism?

Answer 19

lines of force add together
increased flux density

Question 20

what factors affect magnetic field strength

Answer 20

number of turns in the coil
size of current
size of iron core

Question 21

what is the motor principle

Answer 21

using CURRENT to create MOVEMENT

Question 22

what does the motor principles use?

Answer 22

1 temporary magnet
1 permanent magnet

Question 23

what type of current does the motor principles need to have

Answer 23

alternating current

Question 24

what is the conversion of energy for electromagnetism

Answer 24

electrical
magnetic
kinetic

Question 25

what is electromagnetic induction

Answer 25

creating ELECTRICITY FROM MAGNETISM

Question 26

what does electromagnetic induction use

Answer 26

a permanent magnet
conductor
movement

Question 27

what must happen to create induction

Answer 27

the conductor MUST cross the magnetic lines of force

Question 28

when (in movement) is an induction system at 0V?
peak voltage?

Answer 28

0V when moving parallel to line
peak V when moving perpendicular

Question 29

what factors affect induced voltage

Answer 29

permanent magnet strength
armature (loops in coil, iron core size)
speed of movement
angle armature crosses the lines of force at

Question 30

what does a transformer do

Answer 30

electromagnetism in primary creates a magnetic field
changing mag field creates current in secondary wire
both wires have same # volts per turn

Question 31

what are the turns ratios for transformers?

Answer 31

ratio > 1 step-up
ratio < 1 step-down

Question 32

what is the transformer law

Answer 32

Vs/Vp = Ns/Np

Question 33

what is the conversion of energy for electromagnetic induction

Answer 33

kinetic
magnetism
electricity