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AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread]

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Why is the answer B and not A? Where does the x^2 come from?
Reply 2221
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Original post by 000alex
Does the t in the third equation mean time after the rotation has started?


Yes, if you think about it, the function ωt\omega t in the third equation gives you the angle the coil has turned through relative to the initial point.

Taking the sine of this angle gives you the component of the peak EMF induced when the coil rotates at an angle theta to the normal of the coil face.

Hope that helps!


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Reply 2222
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Original post by saad97
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Why is the answer B and not A? Where does the x^2 come from?


http://www.thestudentroom.co.uk/showthread.php?p=56360579#post56360579


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Original post by CD223


Thank you!
Reply 2224
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Original post by saad97
Thank you!


No worries! Hope that clears it up.


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Original post by CD223
No worries! Hope that clears it up.


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Yes this method is a lot easier than the one I used unsuccessfully aha.
I guess you're confident for this exam? :tongue:
Does anybody have the answer to these, are teacher gave us this document to help us with some a2 but don;t know where its from. Thanks in advance
SYNOPTIC-LOOKS INTERESTING.pdf371.7KB
Reply 2227
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Original post by saad97
Yes this method is a lot easier than the one I used unsuccessfully aha.
I guess you're confident for this exam? :tongue:


Not confident at all! I like physics but I don't like exams and the papers this year are so easy to slip up on! You?


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Reply 2228
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Original post by Sonnyjimisgod
Does anybody have the answer to these, are teacher gave us this document to help us with some a2 but don;t know where its from. Thanks in advance


Haven't personally seen them, sorry. Curious as to why it's unit 6 though? Shouldn't it be unit 4?


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help with this one please
Original post by Sonnyjimisgod
Does anybody have the answer to these, are teacher gave us this document to help us with some a2 but don;t know where its from. Thanks in advance


It seems that there is no mark scheme for it and your teacher probably downloaded it from this link :smile:. Check the last link, unit 6:

http://studentbounty.com/pastpapers/Assessment%20and%20Qualifications%20Alliance%20%28AQA%29/A%20Levels/Physics/Physics%20A/Resources%20&%20Specimen/


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Reply 2231
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Original post by AR_95


help with this one please


ImageUploadedByStudent Room1433095303.775493.jpg


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Original post by CD223


How do u know the distance is square root 2a, I thought it was just 2a

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Can someone please help me here?

The only thing I have trouble with on unit 4 is knowing which hand to use with Generators, motors, emf etc.....

For some reason it is extremely confusing to me. I understand how to use the actual hand itself but, I can't figure out when I have to use it!

Help would be much appreciated!
Reply 2234
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Original post by huniibehi
How do u know the distance is square root 2a, I thought it was just 2a

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By Pythagoras, with the side length of 2a, each of the diagonals has a length of 22a2 \sqrt{2} a.

As P is at the centre of the square (and the centre of each diagonal), the distance to each charge is 2a\sqrt{2} a

ImageUploadedByStudent Room1433096910.847105.jpg


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Original post by CD223
By Pythagoras, with the side length of 2a, each of the diagonals has a length of 22a2 \sqrt{2} a.

As P is at the centre of the square (and the centre of each diagonal), the distance to each charge is 2a\sqrt{2} a

ImageUploadedByStudent Room1433096910.847105.jpg


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Oh I see, thanks! The struggles of doing a level physics without a level maths!
Reply 2236
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Original post by Adangu
Can someone please help me here?

The only thing I have trouble with on unit 4 is knowing which hand to use with Generators, motors, emf etc.....

For some reason it is extremely confusing to me. I understand how to use the actual hand itself but, I can't figure out when I have to use it!

Help would be much appreciated!


Motors/charges moving in magnetic fields = left hand rule

Generators/generating or inducing an emf = right hand rule


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Reply 2237
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Original post by huniibehi
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Oh I see, thanks! The struggles of doing a level physics without a level maths!


Haha, no worries :smile:


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Original post by CD223
Motors/charges moving in magnetic fields = left hand rule

Generators/generating or inducing an emf = right hand rule


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Thank you so much mate! Seems simple but, it just confused me so much like!
Reply 2239
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Original post by Adangu
Thank you so much mate! Seems simple but, it just confused me so much like!


No worries! I guess just always use the left hand rule, except when Generating an EMF, where the Right hand rule is used :smile:


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