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sketching EMF graphs, Current graphs etc

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maxleng:
im thinking there will be a graph sketching Q tomorrow..

im not 100% sure on this, heres a Q from the 2004 sample exam (thers no answers even on itute)



is my graph right?

also could someone PLEASE explain Q 10 2004 exam1 its another graph Q

edit: is the voltage graph just the current graph but a reflection in the x-axis?? thats what ive been told

Galelleo:
shouldnt that graph be a sine curve?

Timtasticle:
Not really. You've got the basics down - where your maximum and minimums are going to be.

But your curve should take a sine wave shape, not blocky.

Edit: Beaten to it  :oops:

maxleng:
oh yeah i see now, it cant really be a flat line as the flux doesn't stay constant at any time  :idea:

Galelleo:
exactly :D

Flux is always changing at a rate of BAcos(theta)...or is it BAsin(theta) ... so while the coil is rotating, the amount of flux is dependant on a cos... or uh sin graph.

it doesnt really matter, as long as you take 0 as 0... so probably sin graph.

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