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

1. They will bring the grade boundaries down due to their error on that, time would have been wasted for students, it impacts overall performance. So this is a good thing

(Original post by 96wst)
Yes I did. If so that is poor on their behalf
2. Did anyone get 1562.5 somewhere

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3. Electric potential:
Couloumbs law (2)
Graph: constant -ve gradient so V isdirectly prop to -1/r and -ve values as -ve potential is associated with a negative charge
27.8nC
4.5x10^-5
1.56x10^3
4. For the capacitor's graph I was feeling cheeky and just drew a near flat line not quite at zero. I find it hard to believe they would make a typo but w/e
5. (Original post by Hexaneandheels)
My first answers on MC were:

ABCDBBCC

Can't remember the sequence after that
I only got two the same as you 😳
6. (Original post by king cobra)
Did anyone get 1562.5 somewhere

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Yeah
7. (Original post by k9000)
Electric potential:
Couloumbs law (2)
Graph: constant -ve gradient so V isdirectly prop to -1/r and -ve values as -ve potential is associated with a negative charge
27.8nC
4.5x10^-5
1.56x10^3
SAME!

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8. Wasn't it 4.5times 10-6

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9. (Original post by MSB47)
I did a less steep graph because I thought with greater time constant it would discharge at a slower rate :/
Yeah that's exactly what I thought

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10. (Original post by jf1994)
I think I did this too, but did you get minus 27.8 for the charge? And then just discounted because it asks for magnitude?

I think I got 4.5x10^-3 or something for work done by same method you used, and then 1xxx (19xx?) for electrical field strength, can't remember exactly.
yeah i remember a 4.5x10 to something, cant remember what i did for the next
11. 0.12 for emf induced anyone?
12. And why was it negative

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13. I really liked that paper, I know I got the one about which statement isn't correct about the gravitational potential wrong. Also all the damping but wrong and the curve as I forgot to use a shallower gradient but pretty sure I got the rest of the marks. What was the answer to number of electrons? I got 2.2*10^10, not sure if that's right 😊

EDIT: I also dropped a mark on the electric field strength one as my final answer wasn't negative 😓
14. (Original post by king cobra)
Did anyone get 1562.5 somewhere

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Yeah didn't you have to write 1600 Vm-1 cause it was 2.s.f

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15. Yes!! I was so worried but I got all those too

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16. (Original post by king cobra)
Did anyone get 1562.5 somewhere

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I think I got that for my electric field strength
17. What did people get fir the hight lifted by the capacitor motor? Becuase i got 1.9m using mgh and the energy stored
18. (Original post by Qwerty1996)
Yes!! I was so worried but I got all those too

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It was to the power of -6 not -5

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19. (Original post by cudders96)
Anyone else notice on the current graph question that the first resistance was 150Ω, but the second was 300KΩ? Think it was probably a typo on AQA's behalf, because the resulting graph would have to start with initial current 2000x lower than the original graph.
I notice that too, I was like what the heck

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20. I didn't notice any typo for the capacitor?? Maybe I just misread it, I just drew a graph of a capacitor of twice the time constant...

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