Thank you for that but if it was something similar (I know the vcaa exam had a diagram) does it matter what position it started off in as long as it tells you the turns the revolutions and the time?
Yes it does matter.
Change in flux is the change from
initial position to the
final position.
If it started off where flux was 0, and then changed to where flux was about halfway from it's maximum - then the value would change
Or if it when 0 to maximum, then the value would be different, but since we only consider the magnitude, it'd effectively be the same thing as if it was going max to 0.
But yeah the initial position does matter and you need it to be able to figure it out (unless you're given dflux or even dflux/dt straight out, then you don't need to calculate it yourself). If you're not given a diagram, then you might be given how much of an angle it rotated or something like that.