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

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    (Original post by chizz1889)
    It was rotating so you had to use BANwSinwt then divide by root2
    initial was just BAN because it was perpendicular to the field

    Final was 0 because parallel to the field

    So average emf was in fact BAN divided by time
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    (Original post by NEWT0N)
    Why were there 50 answer boxes for the multiple choice?
    There was another MC sheet, didn't you do it?
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    (Original post by Disney0702)
    Section B Q2

    What did you all say for why V is negative on the graph?
    Q is negatively charged so work is done by the positive test charge
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    Do you think it's worth writing a complaint to AQA about the obvious typo in the capacitors question? Just in case it hasn't come to their attention that their proof-reading process is awful...
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    (Original post by NEWT0N)
    Why were there 50 answer boxes for the multiple choice?
    There are other AQA subject exams that do multiple choice too and they use the same answer sheet. I'm guessing some of the subjects have 50 multiple choice questions
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    (Original post by chizz1889)
    Q is negatively charged so work is done by the positive test charge
    Thank god! I said Q was negative as well
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    (Original post by NEWT0N)
    initial was just BAN because it was perpendicular to the field

    Final was 0 because parallel to the field

    So average emf was in fact BAN divided by time
    I hope so cos that's what I put but I feel like I got it wrong 😊
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    (Original post by NEWT0N)
    Why were there 50 answer boxes for the multiple choice?
    Its a standard multiple choice answer sheet, so its used for other exams where there may be more than 25 questions
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    (Original post by xela238)
    I got something like 0.12?
    Yep emf is 0.12V

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    (Original post by Mehrdad jafari)
    I think that is a general sheet for exams and not specifically for phys4


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    Ah yes, thanks. (Also just remembered that Lau answered this for me yesterday)
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    (Original post by jf1994)
    There was another MC sheet, didn't you do it?
    What other one?
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    Wasn't a fan of that at all tbh. Felt like an easy paper but as someone prone to brainfarts I'd have preferred a harder one.
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    (Original post by chizz1889)
    I hope so cos that's what I put but I feel like I got it wrong 😊
    I'm starting to doubt my answer now, can somebody confirm?
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    (Original post by QueNNch)
    Q.22 is 1/√2
    I got 21 wrong (I put A)

    All other answers SAME! Weeeeeeee
    Q.20 is wrong, it would be 0, obviously the force is twice as great but the current is reversed to the force acts upwards thus the reading is zero, it asks for the reading not the relative force
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    (Original post by salicional)
    Do you think it's worth writing a complaint to AQA about the obvious typo in the capacitors question? Just in case it hasn't come to their attention that their proof-reading process is awful...
    What was the typo, don't think I noticed!
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    (Original post by jf1994)
    There was another MC sheet, didn't you do it?
    Haha nice try
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    (Original post by chizz1889)
    Definitely not incorrect, I got it incorrect I said no damping. Change in Damping is not how to air resistance varies. It his how the air resistance varies in relation to change in momentum. If you don't believe me go and do an experiment, damping has no effect on time period in the first place.
    The added mass doesn't effect damping. Of course damping affects the time period, but the mass added has not increased the damping force, as the time period is independent to the mass added, vmax is independent, and this equation here, the 'drag force' which is what the damping force in this instance is, is denoted below. It is true a damping force changes the time period, but changing the mass doesn't change the maximum velocity , assuming the ring has no significant area, which is a fair assumption. Name:  ImageUploadedByStudent Room1434024041.290457.jpg
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    I've seen a general trend that the grade boundaries have been getting higher and higher every year for PHYA4.

    It will definitely stay the same or go higher this year too, considering the paper was easier than last years
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    (Original post by Disney0702)
    Section B Q2

    What did you all say for why V is negative on the graph?
    The point charge is negative
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    (Original post by Chazley123)
    Q.20 is wrong, it would be 0, obviously the force is twice as great but the current is reversed to the force acts upwards thus the reading is zero, it asks for the reading not the relative force
    No, there has been a very similar question to this in a previous year (identical but with different numbers) and what they put for 20 is right
 
 
 
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