with section A, you can give reasonable guesses and you'd have about 50% chance of getting it right because for some questions you can eliminate two obviously incorrect answers, so if you're stressed for time, section A is easier to rush through without compromising your mark too much(Original post by particlestudent)
I honestly don't know which one to do first...
section B has more marks per question and you should try to get it done first because its harder to guess those if you run out of time
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AQA Physics PHYA4 - 20th June 2016 [Exam Discussion Thread] watch
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alevelstresss
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- 19-06-2016 16:54
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- 19-06-2016 16:58
(Original post by Nikulp68)
There was a printing error in one of the questions; the capacitor one.
AQA apologises for the unfortunate typographical error which crept in to the resistor values in part(a) of this question. Both values ought to have been given in kΩ. The majority of students actually answered the question as it had been intended to appear, and so the mark scheme that would have applied to the intended question in part (ii) was used when marking their work. The students who answered the question as it appeared in the paper were not disadvantaged, because an alternative mark scheme which gave full credit for completely correct responses was adopted for them.Last edited by micycle; 19-06-2016 at 17:00. -
AQATrolledMe
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- 19-06-2016 16:58
(Original post by Pavinder100)
Attachment 553052could someone explain to me how to answer part (ii) in the question
I know that when you first turn it on there is a rate of change of magnetic flux linkage which = emf
Since its a dc current the new change will occur and stay constant. which causes the pointer to deflect in one direction and back
I believe that emf is felt in coil q and then since there is a circuit current is induced. -
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- 19-06-2016 16:58
Obviously it's hard to predict but what do you guys think the 6 marker will be on? What would be an ideal topic/worst nightmare for you?
Personally if it's capacitance I'll probably cry on the page and get more marks than I would writing anything -
AQATrolledMe
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- 19-06-2016 16:59
(Original post by Pavinder100)
Attachment 553052could someone explain to me how to answer part (ii) in the question
I know that when you first turn it on there is a rate of change of magnetic flux linkage which = emf
Since its a dc current the new change will occur and stay constant. which causes the pointer to deflect in one direction and back
I believe that emf is felt in coil q and then since there is a circuit current is induced. -
Music With Rocks
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- 19-06-2016 17:00
(Original post by particlestudent)
Is everyone doing Section B first? -
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- 19-06-2016 17:00
(Original post by Pavinder100)
Attachment 553052could someone explain to me how to answer part (ii) in the question
When the resistance is decreased there is a reduction in current which reduces the strength of the magnetic field and therefore flux linkage.
A reduction in flux linkage is a negative EMF.
Therefore the ammeter reads negative temporarily. -
particlestudent
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- 19-06-2016 17:00
(Original post by alevelstresss)
with section A, you can give reasonable guesses and you'd have about 50% chance of getting it right because for some questions you can eliminate two obviously incorrect answers, so if you're stressed for time, section A is easier to rush through without compromising your mark too much
section B has more marks per question and you should try to get it done first because its harder to guess those if you run out of time
The user above you mentioned looking through B first to see how hard it looks, I may do that...
I hope there is barely anything on EM induction apart from transformers. -
particlestudent
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- 19-06-2016 17:02
(Original post by mgill17)
Obviously it's hard to predict but what do you guys think the 6 marker will be on? What would be an ideal topic/worst nightmare for you?
Personally if it's capacitance I'll probably cry on the page and get more marks than I would writing anything.
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- 19-06-2016 17:04
(Original post by particlestudent)
I think it will be on gravitational fields or capacitors. I hope it's one of these.
Please not capacitance, god no -
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- 19-06-2016 17:05
Hopefully a practical on pendulums or capacitance will be a nice 6 marker.
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Cheesecake Ali
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- 19-06-2016 17:06
I understand why it flicks less but could someone please explain why it flicks in the opposite direction???
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- 19-06-2016 17:07
Is this right for EM induction. E.m.f. is induced in conductor, this induces a current which produces a magnetic field that opposes motion?
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- 19-06-2016 17:08
(Original post by rory58824)
Hopefully a practical on pendulums or capacitance will be a nice 6 marker.
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- 19-06-2016 17:09
(Original post by Yo12345)
Variable length? 8 values of length dropped at same amplitude? T measured (3 and average). Plot T^2 v l?
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AQATrolledMe
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- 19-06-2016 17:10
(Original post by Yo12345)
Is this right for EM induction. E.m.f. is induced in conductor, this induces a current which produces a magnetic field that opposes motion?
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Thats seem right, you could score more marks if you include Faradays law and Lenz law -
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- 19-06-2016 17:11
What did people think of the UMS for ISAs this year? Same as last year? I got 47/50 and was wondering if that would be 54 UMS like last year, more, or less, so I can help work out what I need for an A
Last edited by veldt127; 19-06-2016 at 17:13. -
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- 19-06-2016 17:14
(Original post by Cheesecake Ali)
I understand why it flicks less but could someone please explain why it flicks in the opposite direction???
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It's not actually possible to say that it "flicks less" as you don't know how quickly the resistance of the variable resistor was increased. -
ememoville
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- 19-06-2016 17:16
(Original post by Cheesecake Ali)
I understand why it flicks less but could someone please explain why it flicks in the opposite direction???
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It is in the opposite direction because while S is still closed and the resistance is reduced there is a rate of change in flux linkage but the emf is induced in the other direction (loosely speaking) so the ammeter deflects the other way -
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- 19-06-2016 17:18
(Original post by AQATrolledMe)
Thats seem right, you could score more marks if you include Faradays law and Lenz law
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