Solving the EMF Problem: Cross Sectional Area, Number of Turns & Revolutions/s

[Pepsi24chevy]

Here is the question. A coil rotates at 200 revoltuions per second in the Earth's field. If the coil has a cross sectional area of 20cm^2 and has 1000 turns, approximately what emf is induced in the coil as a function of time?

I know emf= int of E*dL and that the voltage proudces across a coil is V= NwBA sin(wt). I guess what i don't get is what would i use for my B or do i need to use a different equation.

 

[Pepsi24chevy]

bump

 

[DaMastaofFisix]

Unless I'm mistsaken, the B in the statement here is the Earth's B. The Value for Earth is .5 Gauss, an extremely weak number compared to the tesla. find a conversion factor to get that value in tesla and there's your B value. now remember, the voltage is also written as v=vmaxsin(omega t). V max is dependent abviously on your B field, you number of turns and so on. If you need more help or if that wasn't suficient, then let me know