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

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


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    Yes
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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
    you reckon they'll penalise me for putting the field strength to two sig figs (1.6x10^3)?
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    (Original post by emmalem2406)
    What did you put for the last MC question about the steel core?
    I said it was to increase the mechanical strength of the wire.
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    (Original post by 000alex)
    0.12 for emf induced anyone?
    What formula did you use?
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    0.19 for induced emf?
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    (Original post by 000alex)
    0.12 for emf induced anyone?
    Average I got 0.0475. Worked out what I was at 90• (0.0950) then divided by 2 ☺️ (Think I may have needed to divide by root2 though as I think RMS applies
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    (Original post by dandelion-field)
    What formula did you use?
    I divided by root 2 because it wanted mean, and i was like rms from unit 1
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    (Original post by IWantSomeMushu)
    I said it was to increase the mechanical strength of the wire.
    That's correct 😋
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    0.12 was right I think


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    1.4m for energy stored by capacitor= mgh?
    0.06 Wb Turns for a question about magnetic fields, and the emf as 0.12V for second part (think thats wrong)

    circular motion Qs
    130 degrees
    T=15N (think thats wrong)
    2 revolutions


    6 marker
    talked about constant speed but accelerating ..change in direction so velocity etc.. so F=MA newtons second law = mv2/r, then some stuff about resolving tension horizontally and vertically with MG acting downwards etc, and newtons laws about opposite and equal force and no resultant force=0 if nothing else acting on it at rest/constant velocity...
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    (Original post by MSB47)
    you reckon they'll penalise me for putting the field strength to two sig figs (1.6x10^3)?
    That's what I did, scientifically it's correct but idk what the exam board allows


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    (Original post by dandelion-field)
    What formula did you use?
    e=N(change in flux/change in time)
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    (Original post by wat a wizard)
    0.19 for induced emf?
    I got 0.19!! Was you flux linkage like 0.0605 wb or something like that also?
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    (Original post by chizz1889)
    Average I got 0.0475. Worked out what I was at 90• (0.0950) then divided by 2 ☺️ (Think I may have needed to divide by root2 though as I think RMS applies
    It said average emf induced, i don't know if that means rms or not
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    (Original post by king cobra)
    It was to the power of -6 not -5


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    -5 i think you must've done 2.78x10-9 in your calculations instead of 2.78x10-8 if using whole values
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    I enjoyed the MC quite a bit, but section B was a nightmare for me...
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    Grade boundary predictions?
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    (Original post by king cobra)
    0.12 was right I think


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    I put 0.12v!


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    Alright guys I drew my graph like this

    Name:  1434019524377.jpg
Views: 468
Size:  101.6 KB

    I think in probably wrong because the initial current (y axis) would be lower.

    Thoughts?
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    (Original post by chizz1889)
    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 😓
    Think i done the same thing, also i got 4.4x10^10 😓
 
 
 
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