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

1. (Original post by study.bud)
Sorry but no actually, F=EQ and E=V/d so F=VQ/d. So it would have been the reciprocal graph. The electric field strength is constant, not the force
It was a uniform field mate, E is constant and so F is constant, it was a ppq
2. (Original post by mclancy1998)
wha gwarn and salah malekum hit mans up wiv some flux linkage to the unofficial mark scheme if uz know what man means
Um actually have no clue wtf you're saying
3. (Original post by kingaaran)
Attachment 553594

I was annoyed and just was like, **** it, and took it out of the room.

I have no time atm, but sometime this evening I will post the answers

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Please post pics of the inside, I can't remember what I put for the multiple choice
4. (Original post by Questioner1234)
In the momentum proof I accidently used capital M instead of N interchangably throughout the proof, how many marks will I lose for this. The final answer was the same as what it was meant to be but towards the start of the proof I used M not N????????
If the guy's a **** you won't get any marks, but probably would only lose one. However, for now, assume all marks lost cos an examiner can
5. (Original post by kingaaran)
Attachment 553594

I was annoyed and just was like, **** it, and took it out of the room.

I have no time atm, but sometime this evening I will post the answers

Posted from TSR Mobile
Could you post pictures of the questions? Then the community will dissect it for you
6. (Original post by study.bud)
Sorry but no actually, F=EQ and E=V/d so F=VQ/d. So it would have been the reciprocal graph. The electric field strength is constant, not the force
In a uniform Field, F=EQ
Therefore, if E is constant (it is) and Q is constant (it is) then F is constant (it is)
So it was the straight horizontal line graph.
7. (Original post by splashywill)
You'd probably need a high A if not an A* to be honest... it'll be tight- plus you might have done better in unit 4 that you think
I prefer unit 5 over unit 4 any day XD... plus i came out of that exam hall feeling like the paper made me a new butthole XD
8. (Original post by study.bud)
Yes that's what I said..mate
You said its a reciprocal graph, if F is constant its a horizontal line
9. (Original post by study.bud)
Sorry but no actually, F=EQ and E=V/d so F=VQ/d. So it would have been the reciprocal graph. The electric field strength is constant, not the force
Lol you just stated that the electric field strength is constant but the force is not? F = EQ, E is constant, Q is constant thus F is also constant.
10. (Original post by Jay1421)
Do you remember if that was A or B?
B I think
(Original post by Jordenwilder1998)
What did people get for the q with the right angle triangle I put 3F to do with gravity?????
I got that
(Original post by Nikhilm)
Yeah I got that too, cos X's force to the right was greater than Y's to the left so resultant to the right
Nice
(Original post by Aethrell)
What did the graph look like for that parallel plate multiple choice question?
Horizontal line
(Original post by Questioner1234)
In the momentum proof I accidently used capital M instead of N interchangably throughout the proof, how many marks will I lose for this. The final answer was the same as what it was meant to be but towards the start of the proof I used M not N????????
I can understand your worry but 8 just recommend you try to make up for it in unit 5
11. (Original post by study.bud)
Sorry but no actually, F=EQ and E=V/d so F=VQ/d. So it would have been the reciprocal graph. The electric field strength is constant, not the force
d is constant because it's the distance between the plates
12. why did i get 11 farads for the capacitance, i did q/v and worked out the gradient, surely i wont lose 3 or will there be a range of answers
13. For the electromagnetic brake

I put:

Advantage: A bigger brake force can be applied by making the magnetic field stronger

Disadvantage: The brake would heat more

Are any of these right?

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14. (Original post by tanyapotter)
Do you remember what you got for the very last transformer question, about why high voltages are needed? It's definitely so that current is lower, right?
Yes definitely : )
15. so is there any unofficial mark scheme?
16. (Original post by JC_Costales)
I prefer unit 5 over unit 4 any day XD... plus i came out of that exam hall feeling like the paper made me a new butthole XD
Yeah me too! what extra unit are you doing for 5?
17. (Original post by Ginpls)
Yes definitely : )
stfu
18. (Original post by study.bud)
Um actually have no clue wtf you're saying
19. (Original post by liverpool2044)
why did i get 11 farads for the capacitance, i did q/v and worked out the gradient, surely i wont lose 3 or will there be a range of answers
11 Farads is a ridicoIous amount for a capacitor? I've seen 1 farad max in aII questions ever.
20. (Original post by palacefloor)
11 Farads is a ridicoIous amount for a capacitor? I've seen 1 farad max in aII questions ever.
micro sorry haha

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