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Old Jun 12th 2017, 12:24 PM   #1
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Flux dependant upon number of turns?

https://atarnotes.com/forum/index.ph...3546#msg953546

http://i.imgur.com/XtCj6OP.png (worked solution on left and plain answer on right; they aren't the same and neither take into account the number of turns, which adds to the confusion)
Is the book's answer correct? Doesn't the flux increase when you increase the number of turns of wire? I'm getting conflicting information from multiple places: https://physics.stackexchange.com/qu...-magnetic-flux the dude says N (number of turns of wire) affects ϕ.
Also: http://i.imgur.com/hzwGz0n.png the book even plainly states that. However, nowhere in the book is N included in the ϕ=BA equation.
What's going on!?
I have a test on this area in 4 hours and i need to know this
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Flux dependant upon number of turns?-qasd.png   Flux dependant upon number of turns?-qasd2.png   Flux dependant upon number of turns?-qasd3.png  
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Old Jun 13th 2017, 01:51 PM   #2
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My guess (and it is really just a guess) is that the coiling is largely a way of packaging the wire to achieve a larger cross-sectional area in a sensible volume.
Each loop of the coil contributes just 0.24cm² to the total area but 50 turns adds up to a respectable 12cm².
This seems to be what is implied by http://i.imgur.com/hzwGz0n.png
The review question answer just looks like a miss-print
the equation shown works out to 0.00003 not 0.003.
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Last edited by Woody; Jun 13th 2017 at 01:59 PM.
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