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

1. What was the additional energy stored in the capacitor?
2. What grade/ums will 62/63 most probably be ?

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3. (Original post by tanyapotter)
stfu
Cyber abuse TANYA POTTER
4. (Original post by splashywill)
yeah I'm pretty sure it was 3F
Isn't it an equipotential though?
5. (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
Hate to break it to you but 11 farads is huuuuge

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6. (Original post by Squishy•)
Isn't it an equipotential though?
I got 3F

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7. 3.6x10^-5 J

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8. (Original post by Euclidean)
Hate to break it to you but 11 farads is huuuuge

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micro i meant sorry
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
But D is no reciprocal either, as it touches both axes
10. (Original post by Yo12345)
3.6x10^-5 J

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@ rory

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11. (Original post by Euclidean)
I got 3F

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I can't remember the question but i thought it asked something like the difference in force between x and y so whats the difference between closest point on the circle but isn't it the same because anywhere on a circle has the same distance from the centre and therefore the same force.
12. (Original post by perpetua)
But D is no reciprocal either, as it touches both axes
F= EQ - E is constant anf Q is constant, so surely F is constant?
13. (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
The answer was definitely the graph showing constant force.
14. (Original post by Ginpls)
Cyber abuse TANYA POTTER
i will literally kill you gin
15. (Original post by Squishy•)
I can't remember the question but i thought it asked something like the difference in force between x and y so whats the difference between closest point on the circle but isn't it the same because anywhere on a circle has the same distance from the centre and therefore the same force.
It was the force between X and Y and you had to use Pythagoras to solve it, resulting in an answer of 3F
16. (Original post by tanyapotter)
i will literally kill you gin
...............................
17. For the 2nd last multiple choice with the train through the magnetic field did anyone get C?
(Original post by Yo12345)
For the electromagnetic brakeI put:Advantage: A bigger brake force can be applied by making the magnetic field strongerDisadvantage: The brake would heat moreAre any of these right?Posted from TSR Mobile
Yeah you could potentially get a larger brake force if you have a rather powerful electromagnetic. Disadvantage not sure, with a high resistance and current to get the high brake force the coil could heat up more.
18. (Original post by Vikingninja)
For the 2nd last multiple choice with the train through the magnetic field did anyone get C?

Yeah you could potentially get a larger brake force if you have a rather powerful electromagnetic. Disadvantage not sure, with a high resistance and current to get the high brake force the coil could heat up more.

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19. (Original post by marioman)
The answer was definitely the graph showing constant force.
There is a question is one of the past papers which asks you to find the force between two parallel points at the midpoint. Of course it's QV/D but most chose distractor QV/2D. The force is the same at all points between plates, it is uniform. So yeah it is.
20. (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
What points did you use on the graph? Since it was gradient I did the differences between two points. I got 8 micro farads.

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