Need help with Magnetism Question ( solved)

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Need help with Magnetism Question ( solved)

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Whatlol

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Need help with Magnetism Question ( solved)

« on: July 24, 2010, 05:28:48 pm »

Hey guys im having a few troubles with question 5 b.

I understand that the maximum emf will occur at 90 degrees.

I tried finding the emf produced by using the following method but i am unsure as if its correct.

i have been told you can use the equation $EMF = NBA \omega sin ( \omega t)$

If i was to use this, $\omega = 2 \mathbf{x} \pi 42 = 84 \pi$
:. the period is $\frac{2 \pi }{ 84 \pi } = \frac{1}{42 }$

:. im not sure what to put in for the time, im guessing you either put in the time taken from 75 to 90 degrees or from 0 to 90 degrees. $\frac{6}{42 \mathbf{x} 24 } = \frac{6}{1008 }$ (i decided to use from 0 to 90 degrees )

so then the emf will $= 100 \mathbf{x} 0.005 \mathbf{x} 0.002 \mathbf{x} 84 \pi \mathbf{x} sin (84 \pi \mathbf{x} \frac{6}{1008 } ) = 0.26389V$

the answer supplied in the book is 0.0263 V

- No more help needed-.

« Last Edit: July 27, 2010, 09:18:29 pm by Whatlol »

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