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

1. What do you think it will be for an A? around 50 marks or higher?
2. (Original post by Edpark123)
Had an absolute mare for this and completely missed out the final question, for some reason thought it was the end of the paper after the 6 marker question up to the 4g one. Can anyone tell me how many marks question 5 was out of?
i think it was 7 marks total. 2 then 3 then 2
3. (Original post by Datta10)
I got 28s too for the time constant, then around 59000 ohms I think for resistance

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I think I got sth similar. May have been 57000 ish. I remember I had a string of numbers and I was contemplating on whether or not I should keep it to 3 sf or sth. I left it as full integer at the end. Do you think that'll be all right?
4. (Original post by exmerelda)
can anyone put up how they did the momentum of alpha question? i couldn't do it but i wanna see if i got any of the method marks
E(alpha) +1/2NV^2 = E
V=mv/N Substituting for V gives:
E(alpha) + (1/2)(1/N)(m^2)(v^2) = E
E(alpha) + (m/N)E(alpha) = E
E(alpha)(N+m)/N = E
E(alpha) = E(N/(N+m))
5. (Original post by Mango Milkshake)
I wrote car takes longer to stop. No idea if its right
I said that!!!
6. Section B last year was easier than this.
7. (Original post by Mango Milkshake)
Was it suppose to touch the x-axis? mine didnt go all the way down but same shape

???
Your second part of the graph isn't "curvey" enough. Remember 1/r^2 relationship. 2/3.
8. (Original post by marioman)

Hopefully if a few contribute then we can get a rough marks scheme going.
(Original post by Questioner1234)
I said g would be 4x as big
got 5.9x10^4 for something I think it was resistance
28s for time constant
1.15 x 10^-15 for something
6.06X10^6 for something
MCQs:
D
B
B
D
D
C
D
B
B
B
B
D
C
A
B
D
B
A
C
A
A
D
C
B
D
I got about 20 of them the same as you not sure what happened in the middle, thats where theyre different
9. (Original post by tanyapotter)
Would saying that the constant magnetisation and demagnetisation of the electromagnet would waste energy be a valid disadvantage?

Also, I accidentally put T^2 on the x axis and l on the y axis in the 6 marker - how many marks would I lose for that?
I said (T/(2*pi))^2 on x axis, l on the y axis - which is right, as gradient is g.

You would possibly lose 1 mark for not saying 'evaluate (T/(2*pi))^2.
10. (Original post by idk97)
i feel u bro.... ive tried so flipping hard all year but after that i'll be surprised if i got a D
Here here!
11. Was the direction from X to Y or Y to X
12. (Original post by Edpark123)
Had an absolute mare for this and completely missed out the final question, for some reason thought it was the end of the paper after the 6 marker question up to the 4g one. Can anyone tell me how many marks question 5 was out of?
After the 6 Marker there was a 3 Mark Question on about Time Period being miscalculated, 3 Marks on Electromagnetic Laws (maybe 4 pretty sure it was 3 though). A 3 marker on Lenz's Law and then finally a 2 Marker on Disadvantages of Electromagnetic Brakes so you have missed:

13. (Original post by kingaaran)
I worked out the energy of the capacitor by the area under the graph - is this valid?

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Well it's the same thing since the area of a triangle is 1/2 height(charge) x width (voltage) which is exactly as the formula E=1/2 QV on the formulae sheet you would have otherwise used.
Did you remember to multiply 2.2 by 10^-6 ?
14. (Original post by kingaaran)
Was the direction from X to Y or Y to X
X to Y I think
15. Thought it was a really nice paper
16. (Original post by kingaaran)
Was the direction from X to Y or Y to X
I put x to y

you?
17. (Original post by Questioner1234)
Attachment 553448did everyones graph look like this????
Minimum closer to Venus

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18. I thought Y to X, they would both be positive so repulsion?
19. What did you guys get for the potential with the 1 nC and 2nC? Multiple choice question?
20. (Original post by CourtlyCanter)
Well it's the same thing since the area of a triangle is 1/2 height(charge) x width (voltage) which is exactly as the formula on the formulae E=1/2 QV sheet you would otherwise have used.
Did you remember to multiply 2.2 by 10^-6 ?

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