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

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    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
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    Did anyone get 1562.5 somewhere


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


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    Yeah
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    (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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    Wasn't it 4.5times 10-6


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    (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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    (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
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    0.12 for emf induced anyone?
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    And why was it negative


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    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 😓
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    (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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    Yes!! I was so worried but I got all those too


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    (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
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    What did people get fir the hight lifted by the capacitor motor? Becuase i got 1.9m using mgh and the energy stored
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    (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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    (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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    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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