December 09, 2019, 06:59:45 pm

### AuthorTopic: Magnetic Flux Question  (Read 142 times) Tweet Share

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#### dream chaser

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##### Magnetic Flux Question
« on: September 25, 2019, 11:45:03 am »
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Hi Guys,

Just a quick question. Does the number of turns affect the amount of magnetic flux? I know the VCE Physics formula sheet has flux = B x A, but if there is more than one turn in the alternator, can flux = N x B x A where N= number of turns?

So if a question asks you to find the average emf in the coil, when finding the change in flux, will I just make flux= B x A. Then when I use the average emf formula, then I put N=10 of what ever as EMF = =N x (change in flux/ change in time)?

All replies will be much appreciated. Thanks
« Last Edit: September 25, 2019, 11:53:44 am by dream chaser »

#### Just another student

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##### Re: Magnetic Flux Question
« Reply #1 on: October 08, 2019, 02:44:10 pm »
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Hi Guys,

Just a quick question. Does the number of turns affect the amount of magnetic flux? I know the VCE Physics formula sheet has flux = B x A, but if there is more than one turn in the alternator, can flux = N x B x A where N= number of turns?

So if a question asks you to find the average emf in the coil, when finding the change in flux, will I just make flux= B x A. Then when I use the average emf formula, then I put N=10 of what ever as EMF = =N x (change in flux/ change in time)?

All replies will be much appreciated. Thanks

I think the process you described is correct, but someone feel free to correct me.
So I think number of turns doesn't affect the magnetic flux but does affect EMF

#### Erutepa

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##### Re: Magnetic Flux Question
« Reply #2 on: October 08, 2019, 05:18:30 pm »
+2
Hi Guys,

Just a quick question. Does the number of turns affect the amount of magnetic flux? I know the VCE Physics formula sheet has flux = B x A, but if there is more than one turn in the alternator, can flux = N x B x A where N= number of turns?

So if a question asks you to find the average emf in the coil, when finding the change in flux, will I just make flux= B x A. Then when I use the average emf formula, then I put N=10 of what ever as EMF = =N x (change in flux/ change in time)?

All replies will be much appreciated. Thanks
Thats right! Flux really is a measurement of how much feild is passing through an area - so the number of turns does not change the amount of field passing through the area made by the coil.
And yes, you are right about the formula for calculating the emf induced in a coil (faraday's law) - I think it was a typo, but note that N has a negative coefficient.
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