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

1. (Original post by Mehrdad jafari)
The question refers to a fixed charge. I think you cannot have a uniform electric field with a fixed charge, could you?

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Well a fixed charge could be in the presence of two parallel plates couldn't it? Idk.

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2. (Original post by CD223)
Well a fixed charge could be in the presence of two parallel plates couldn't it? Idk.

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True, but even if that was the case still the field would vary inversely to the distance square

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3. (Original post by Mehrdad jafari)
True, but even if that was the case still the field would vary inversely to the distance square

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I don't really know why it was missed out. If I didn't see the erratum notice I would have just answered it and carried on. The "correct" answer is C according to the mark scheme. I'm just more puzzled why it was left out.

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4. (Original post by CD223)
I don't really know why it was missed out. If I didn't see the erratum notice I would have just answered it and carried on. The "correct" answer is C according to the mark scheme. I'm just more puzzled why it was left out.

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Yeah, that's what I'm think about as well. I think they ignored it as the question wasn't with enough clarity

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Also, how do you vary current and voltage in a circuit?
6. (Original post by l1lvink)
Also, how do you vary current and voltage in a circuit?
No problem!

Current is dependent on voltage so to change the current you need to change the voltage. Since Current is proportional to voltage( as in I=V/R), increasing the voltage will increase the current as voltage is the deriving force of the electrons. But sometimes a situation is more complicated than that. Are you referring to any particular context?

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7. (Original post by l1lvink)
Also, how do you vary current and voltage in a circuit?
Usually this is done with a variable resistor.

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8. (Original post by CD223)
Usually this is done with a variable resistor.

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Yeah, that's true, i failed to mentioned that.

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9. (Original post by CD223)
Does anyone know why they omitted question 15 of the MC from January 2011 of the PHYA4 paper? Is it because it was ambiguous as to whether it was a uniform or radial electric field?

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They made a mistake on the formula booklet
10. (Original post by ubisoft)
They made a mistake on the formula booklet
Oh I see. Did they get the formulae wrong?

How ironic :L

You would have thought they could just tell candidates the correct formula.

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11. (Original post by CD223)
Oh I see. Did they get the formulae wrong?

How ironic :L

You would have thought they could just tell candidates the correct formula.

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Lol, they are even sceptical about the formulas themselves

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12. (Original post by CD223)
Oh I see. Did they get the formulae wrong?

How ironic :L

You would have thought they could just tell candidates the correct formula.

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Yeah, they could've just put the correct formula on the erratum
13. (Original post by ubisoft)
Yeah, they could've just put the correct formula on the erratum
Yeah haha

Out of interest, How many papers have you done for each unit?

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14. anyone know where i can find the Specimen paper? thanks x
15. (Original post by CD223)
Yeah haha

Out of interest, How many papers have you done for each unit?

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I've done 4 papers for unit4 just in the last few days. Haven't done any unit 5 yet. wbu?
16. (Original post by ubisoft)
I've done 4 papers for unit4 just in the last few days. Haven't done any unit 5 yet. wbu?
Done both 2010, 2011 and 2014 papers for both units. Still got 2012 and 2013 to go

Sucks how few papers there actually are. Especially unit 5. How are you compensating for that?

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17. (Original post by CD223)
Done both 2010, 2011 and 2014 papers for both units. Still got 2012 and 2013 to go

Sucks how few papers there actually are. Especially unit 5. How are you compensating for that?

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I'm not really doing anything extra, the few papers they have should be enough I think, How much are you getting on unit 4?
18. (Original post by ubisoft)
I'm not really doing anything extra, the few papers they have should be enough I think, How much are you getting on unit 4?
Yeah I can't find "extra" papers apart from the exam style questions in the textbook

It's hard to say really. I can't really give an average on the written as it varies so much, but about 20-22 on the MC

You?

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19. (Original post by CD223)
Yeah I can't find "extra" papers apart from the exam style questions in the textbook

It's hard to say really. I can't really give an average on the written as it varies so much, but about 20-22 on the MC

You?

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I mean like ums total out of both sections? on average. I got 110 on June 2011 lol but I fluked it badly, got lots of educated guesses correct on MC, and that one had a lot of mechanics which I'm good at. I'm getting around 20 on mc now, and about 35-40 on written. That's about 100-108 ums / 120 for most papers
20. Can someone help me on Q18 http://filestore.aqa.org.uk/subjects...W-QP-JUN11.PDF

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