M6.3 Electromagnetism

Question 1

what generates a magnetic field

Answer 1

motion of charged particles
and permanent magnets (which is also about the motion of charged particles todo with electron spin not needed though)

Question 2

which direction do field lines go in a magnetic field

Answer 2

North to south

Question 3

what is magnetic flux density

Answer 3

Force on one metre of wire carrying a current of one amp
essentially the strength of a magnet

Question 4

what is a collimator (electromagnetism)

Answer 4

velocity selector where F = EQ and F = BQv
Magnetic field and electric field perpendicular to each other

Question 4

define magnetic flux

Answer 4

Magnetic flux density * area
not confident look into
which is the same as force on 1 metre cubed on one amp
F = BIL
F = ΦAIL
AL = Volume
**

Question 5

define magnetic flux linkage

Answer 5

magnetic flux * by the number of coils

Question 6

what is faradays law

Answer 6

EMF induced is directly proportional to the rate of change in magnetic flux linkage

Question 7

what is lenzs law

Answer 7

the direction of the current induced opposes the change in flux linkage
look at onenote if lost

Question 8

what type of current do split rings generate

Answer 8

DC

Question 9

what type of current do slip rings generate

Answer 9

AC

Question 10

describe a split ring

Answer 10

graphite rings with a gap in the middle
wire rotates using a motor after 90 degrees wires swap terminals
to only generate a positive emf