Post by: chid on August 07, 2008, 08:38:16 pm
In the Physics textbook we use at school (Nelson) it says that the maximum EMF generated in a generator is given by NBA2pif.
Today our teacher told us that VCAA prefer students to consider a quarter or half turn and calculate the EMF according to Faraday's law.
These give different answers.
Can anyone explain to me what the difference is.
Thanks.
Post by: cara.mel on August 07, 2008, 08:43:16 pm
VCAA prefer you to use what is in the study design, eg the method you describe. However they *cannot* penalise you for using alternative methods.
Post by: Mao on August 07, 2008, 09:11:37 pm
I had the exact same dilemma a little while ago.
they do yield different answers, as
whereas the quarter-turn (or half-turn) ==> faraday's law would give the average [which is
and I still do not have an answer as to which one is "correct". But for now, I'm going to stick with the scientifically correct one. If they mark me wrong on the basis that I'm scientifically correct, then shame on VCAA. :P
Post by: cara.mel on August 07, 2008, 09:13:54 pm
Maybe 4 instead of 2pi. I don't remember no pies.
Post by: Mao on August 07, 2008, 09:15:22 pm
actually, the one I'm thinking of that's the same has a 4 in it.
Maybe 4 instead of 2pi. I don't remember no pies.
that'll be average :P
Post by: chid on August 07, 2008, 10:10:19 pm
So theoretically which one is the correct approach although both are acceptable?
Post by: Mao on August 08, 2008, 06:22:50 pm
I don't know which one(s) VCAA accepts though...
Post by: cara.mel on August 08, 2008, 07:29:39 pm
theoretically,is the correct method.
I don't know which one(s) VCAA accepts though...
Given that I have not seen this one outside this forum, I'd say only use the other one.
Also, sorry for accidently modifying your post there, I fail at the extra buttons available to me.