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

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

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Yes
2. (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
you reckon they'll penalise me for putting the field strength to two sig figs (1.6x10^3)?
3. (Original post by emmalem2406)
What did you put for the last MC question about the steel core?
I said it was to increase the mechanical strength of the wire.
4. (Original post by 000alex)
0.12 for emf induced anyone?
What formula did you use?
5. 0.19 for induced emf?
6. (Original post by 000alex)
0.12 for emf induced anyone?
Average I got 0.0475. Worked out what I was at 90• (0.0950) then divided by 2 ☺️ (Think I may have needed to divide by root2 though as I think RMS applies
7. (Original post by dandelion-field)
What formula did you use?
I divided by root 2 because it wanted mean, and i was like rms from unit 1
8. (Original post by IWantSomeMushu)
I said it was to increase the mechanical strength of the wire.
That's correct 😋
9. 0.12 was right I think

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10. 1.4m for energy stored by capacitor= mgh?
0.06 Wb Turns for a question about magnetic fields, and the emf as 0.12V for second part (think thats wrong)

circular motion Qs
130 degrees
T=15N (think thats wrong)
2 revolutions

6 marker
talked about constant speed but accelerating ..change in direction so velocity etc.. so F=MA newtons second law = mv2/r, then some stuff about resolving tension horizontally and vertically with MG acting downwards etc, and newtons laws about opposite and equal force and no resultant force=0 if nothing else acting on it at rest/constant velocity...
11. (Original post by MSB47)
you reckon they'll penalise me for putting the field strength to two sig figs (1.6x10^3)?
That's what I did, scientifically it's correct but idk what the exam board allows

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12. (Original post by dandelion-field)
What formula did you use?
e=N(change in flux/change in time)
13. (Original post by wat a wizard)
0.19 for induced emf?
I got 0.19!! Was you flux linkage like 0.0605 wb or something like that also?
14. (Original post by chizz1889)
Average I got 0.0475. Worked out what I was at 90• (0.0950) then divided by 2 ☺️ (Think I may have needed to divide by root2 though as I think RMS applies
It said average emf induced, i don't know if that means rms or not
15. (Original post by king cobra)
It was to the power of -6 not -5

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-5 i think you must've done 2.78x10-9 in your calculations instead of 2.78x10-8 if using whole values
16. I enjoyed the MC quite a bit, but section B was a nightmare for me...
18. (Original post by king cobra)
0.12 was right I think

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I put 0.12v!

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19. Alright guys I drew my graph like this

I think in probably wrong because the initial current (y axis) would be lower.

Thoughts?
20. (Original post by chizz1889)
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 😓
Think i done the same thing, also i got 4.4x10^10 😓

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