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# AQA Physics PHYA4 - 20th June 2016 [Exam Discussion Thread] watch

1. section b answers anyone, what page?
2. (Original post by C0balt)
If I did 1/2CV-1/2CV that's fine too right?
I should think so. Although it depends on your value of capacitance in part (a) I guess.
3. (Original post by liverpool2044)
section b answers anyone, what page?
I wanna say page 70..maybe
4. (Original post by C0balt)
If I did 1/2CV-1/2CV that's fine too right?
That does sound right, but I think the question is to whether the trapezium should have its rectangle downwards or across..?

edit:Or perhaps a better question would be which was on the x and which on the y axis aha!?
double edit: Does it matter?
5. (Original post by A Slice of Pi)
I should think so. Although it depends on your value of capacitance in part (a) I guess.
Oh crap I meant 1/2QV-1/2QV off the graph
6. (Original post by allofthestars)
would dropping 20 marks give me an A?
Most probably.
7. (Original post by cowie)
That does sound right, but I think the question is to whether the trapezium should have its rectangle downwards or across..?
I did the trapezium also and got a value 0.03 (can't remember what 10^x was) different to 1/2QV-1/2QV thing I did
It was trapezium though, not triangle
8. (Original post by C0balt)
Oh crap I meant 1/2QV-1/2QV off the graph
I don't see why that shouldn't also be right...
9. (Original post by A Slice of Pi)
I don't see why that shouldn't also be right...
Yeah, it interestingly gave a value ever so slightly different to area of trapezium I did however
10. Only re-judgement. Would 56-58 be a definite A?

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11. (Original post by C0balt)
Yeah, it interestingly gave a value ever so slightly different to area of trapezium I did however
I tried something similar to check and it did! But they'll have a range of acceptable values because they'll have anticipated that students will have different methods so don't worry.
12. Did the gradient to find out the capacitance (first question) say 'state your answer to an appropriate number of significant figures' or something?
13. (Original post by C0balt)
I did the trapezium also and got a value 0.03 (can't remember what 10^x was) different to 1/2QV-1/2QV thing I did
It was trapezium though, not triangle

Green trapezium or red trapezium? (Q/V may be wrong way round)

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14. (Original post by cowie)

Green trapezium or red trapezium? (Q/V may be wrong way round)

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Red
15. (Original post by C0balt)
Red
good to hear, thanks!
16. (Original post by Nikhilm)
Did the gradient to find out the capacitance (first question) say 'state your answer to an appropriate number of significant figures' or something?
No sf mark iirc was in gravitational field question
17. (Original post by C0balt)
Yeah, it interestingly gave a value ever so slightly different to area of trapezium I did however
I did counting the squares... Face palm. Not sure if this will get any credit but I got an answer similiar to what most a citing on here
18. (Original post by C0balt)
No sf mark iirc was in gravitational field question
Ah man, do you think gradient = 8.4 for the first question would be in the range?
19. (Original post by Nikhilm)
Ah man, do you think gradient = 8.4 for the first question would be in the range?
Idk I got 8.0 which is quite off too, so let's hope it's 8.2+-0.2. I took the end points of the line which weren't exactly on the grid intersection you know
20. (Original post by A Slice of Pi)
I should think so. Although it depends on your value of capacitance in part (a) I guess.
For part a(I) the capacitance was the gradient of the graph right?

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