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Help with confusing magnetic fields question?
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itsallokay
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#1
Hi guys,
I just needed help with the following question. The answer is C but i don't understand how. Any help will be much appreciated.
Thanks
I just needed help with the following question. The answer is C but i don't understand how. Any help will be much appreciated.
Thanks
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Kallisto
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#2
Sorry, but your thumbnail is readable. Could you tell me what the problem is? or give a better attachment at least?
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itsallokay
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#3
it is the graph one
it says
'The magnetic flux through a coil varies with time as shown by the first graph. Which one of the following graphs, A to D best represents how the magnitude of the induced emf varies in this same period of time'.
it says
'The magnetic flux through a coil varies with time as shown by the first graph. Which one of the following graphs, A to D best represents how the magnitude of the induced emf varies in this same period of time'.
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JamGrip
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MSB47
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#5
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#5
(Original post by itsallokay)
Hi guys,
I just needed help with the following question. The answer is C but i don't understand how. Any help will be much appreciated.
Thanks
Hi guys,
I just needed help with the following question. The answer is C but i don't understand how. Any help will be much appreciated.
Thanks
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itsallokay
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#6
(Original post by JamGrip)
Use Emf = flux/time (the gradient) and you should be able to get it from there
Use Emf = flux/time (the gradient) and you should be able to get it from there
(Original post by MSB47)
Induced EMF is equal to the rate of change of magnetic flux linkage (Faradays law) so when the graph of flux against time shows a region where it is a straight line, there is no induced emf because it is not changing moreover, when the magnetic flux is decreasing and shows a downward diagonal line there is a rate of change of magnetic flux and therefore there is a constant value of induced emf. Following that basic idea should help you realize that it is C. By the way are you doing AQA?
Induced EMF is equal to the rate of change of magnetic flux linkage (Faradays law) so when the graph of flux against time shows a region where it is a straight line, there is no induced emf because it is not changing moreover, when the magnetic flux is decreasing and shows a downward diagonal line there is a rate of change of magnetic flux and therefore there is a constant value of induced emf. Following that basic idea should help you realize that it is C. By the way are you doing AQA?
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Kallisto
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#7
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#7
(Original post by itsallokay)
it is the graph one
it says
'The magnetic flux through a coil varies with time as shown by the first graph. Which one of the following graphs, A to D best represents how the magnitude of the induced emf varies in this same period of time'.
it is the graph one
it says
'The magnetic flux through a coil varies with time as shown by the first graph. Which one of the following graphs, A to D best represents how the magnitude of the induced emf varies in this same period of time'.
As the electromagnetic field is connect to the flux, it is adapted. That is why the highest straigt line of the electromagnetic field is at the maximum of the flux and the decreased one of the electromagnetic field is at the decreased flux line. So C fits at best.
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MSB47
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#8
(Original post by itsallokay)
Thanks and that makes sense
Thanks and yes AQA. And what year and subjects are you doing?
Thanks and that makes sense
Thanks and yes AQA. And what year and subjects are you doing?
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itsallokay
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#9
(Original post by MSB47)
im in second year doing physics maths and politics, finding physics this year extremly challenging how about you?
im in second year doing physics maths and politics, finding physics this year extremly challenging how about you?
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MSB47
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#10
(Original post by itsallokay)
I'm also in second year doing Chemistry, Biology, Physics and Maths and agree that physics is kinda tough
I'm also in second year doing Chemistry, Biology, Physics and Maths and agree that physics is kinda tough
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