Some help plz. (1 Viewer)

[wrxsti]

I duno how to upload images, but in the 2002 HSC paper for Question 10, the answer is written as B.. how exactly can it be "B" shouldnt it be "A"? According to the diagram, firstly minimal magnetic flux is being cut and so no emf, then the next position maxiumum magnetic flux is being cut so the induced EMF should be at its maxiumum.... so it should be "A" right? apparently 35% (or thereabouts) of Band 6 people wrote "A" in 2002

 

[helper]

You need to remember it is the change in flux, not the amount of flux.

At A it quickly goes from A to amount.
At B there is a change but only a small amount.

Think of your sin curve and the graph is steepest when at A, and the slope represents the change in flux.