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

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    Yep, BAN/T
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    (Original post by muhts)
    Yep, BAN/T
    I see my mistake now thanks
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    Any ideas on grade boundaries ?
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    What was the appropriate number of sig fig question? I feel like I didn't notice this
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    (Original post by smoothER)
    What was the appropriate number of sig fig question? I feel like I didn't notice this
    The capacitor and pulling the mass up question
    Love your username btw
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    (Original post by aprocrastinator)
    The capacitor and pulling the mass up question
    Love your username btw
    Ahh how many sf was it? Shame I didn't notice. I recall putting 2 or 3. Thank you
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    If you got 4.8 for emf induced I think you accidently multiplied by 40 coils twice
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    (Original post by DysonCube)
    No, the one in section B with the graph where it asks you to work out the field strength at 0.4m. I got 1875Vm-1 but the MS on here says 1560Vm-1.
    i got 1875 aswell. I still think I'm right lol

    basically - you find the corresponding value for 2.5 on the graph since 1/0.4 is 2.5.

    which is -750V then you use the potential gradient equation which is valid because the same rules from grav field apply to electric fields.

    E = V/r

    so its 750 x 2.5 = 1875. Makes sence! Not sure where 1560 came from lol.
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    Yh
    It was 1875
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    (Original post by Kennethm)
    i got 1875 aswell. I still think I'm right lol

    basically - you find the corresponding value for 2.5 on the graph since 1/0.4 is 2.5.

    which is -750V then you use the potential gradient equation which is valid because the same rules from grav field apply to electric fields.

    E = V/r

    so its 750 x 2.5 = 1875. Makes sence! Not sure where 1560 came from lol.
    (Original post by Boton)
    Yh
    It was 1875
    I think you both accidentally used 750V in your calculations. The corresponding potential at r=0.4m (hence at 1/r = 2.5) was 625V.

    As such, you do E=v/r

    So E = 625/0.4

    = 1562.5 Vm^-1


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    Plus if you use the standard field strength equation you get 1560 too
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    (Original post by CD223)
    I think you both accidentally used 750V in your calculations. The corresponding potential at r=0.4m (hence at 1/r = 2.5) was 625V.

    As such, you do E=v/r

    So E = 625/0.4

    = 1562.5 Vm^-1


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    ohhh rip pretty sure thats like 1 mark lost tho - correct equation used blah blah
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    (Original post by Kennethm)
    ohhh rip pretty sure thats like 1 mark lost tho - correct equation used blah blah
    Not sure how the written will go to be honest. Praying for low boundaries as I made stupid mistakes in section B.


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    (Original post by xela238)
    What question are you referencing?


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    the last one with the 6 marker
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    Anyone got a copy of the MC paper?
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    HAVE YOU GUYS SEEN THIS
    http://www.bbc.co.uk/news/education-33094306

    AQA apologises for the question mistake in the exam 😮
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    (Original post by Sbarron)
    Anyone got a copy of the MC paper?
    Hopefully one will be uploaded later today.


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    What do u guys think the boundaries will be for an a*? Also has anyone done the empa this yr... How did u guys find it?
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    (Original post by QueNNch)
    HAVE YOU GUYS SEEN THIS
    http://www.bbc.co.uk/news/education-33094306

    AQA apologises for the question mistake in the exam 😮
    Aqa better disregard the question because imagine how hard we'd get penalised if we didn't include a 'kilo' in our answer. When I did the paper I thought that one resistor being 2000 times more resistive than the other was a bit strange. Fair is fair so the 3 marks should just be taken from the paper.

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    if we got that question right, where AQA make a mistake, would that be worse for us because then it nullifies our correct answer?
 
 
 
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