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# Magnetic Fields - Calculating average induced emf watch

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1. Hmmmm I'm not sure how to do this question??
2. (Original post by LeCroissant)

Hmmmm I'm not sure how to do this question??

IT is just NBA/time = both of which you have.
3. (Original post by anujsr)
IT is just NBA/time = both of which you have.
Oh okay, thank you!
4. (Original post by LeCroissant)
Oh okay, thank you!
how many marks is the question?
5. (Original post by anujsr)
how many marks is the question?
3 marks.

Which value of flux density would you use though? Because it moves from a position where the flux density is 9.0mT to a position where it is 23.0mT . Or would you just use the change in flux density (23mT - 9.0mT) in the equation?
6. (Original post by LeCroissant)
3 marks.

Which value of flux density would you use though? Because it moves from a position where the flux density is 9.0mT to a position where it is 23.0mT . Or would you just use the change in flux density (23mT - 9.0mT) in the equation?
The equation used is delta NBA/ delta time. So yes you would use 23mT-9mT.
Also note the use of the term average flux. Hence delta time. Hope this helps.

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