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    (Original post by boyyo)
    Protoxylic hey, I remember you from last year! Will you be putting up the unofficial mark scheme this year?
    Unfortunately not, sorry. I'd imagine somebody else would.
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    (Original post by Protoxylic)
    Unfortunately not, sorry. I'd imagine somebody else would.
    Ohh ok thannks anyways
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    How much of the syllabus has everyone covered so far?
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    Where can I access old AQA Physics spec papers and mark schemes. Unit codes: PA02, PA04 and PHY8/W?


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    (Original post by ComradeLenin)
    Where can I access old AQA Physics spec papers and mark schemes. Unit codes: PA02, PA04 and PHY8/W?


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    http://theallpapers.com/assessment-a...iance/a-level/

    Scroll down and click Physics and it should be there.
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    Thank you.


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    One thing I don't get about the time constant in the capacitors topic - I know that the time constant is the time taken for the charge on a discharging capacitor to fall to 37% (RC = 0.37 = e^-1), but why is this such a significant number? Like, what does this even represent?

    The text books don't explain this to me
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    (Original post by kelvin1338)
    One thing I don't get about the time constant in the capacitors topic - I know that the time constant is the time taken for the charge on a discharging capacitor to fall to 37% (RC = 0.37 = e^-1), but why is this such a significant number? Like, what does this even represent?

    The text books don't explain this to me
    The time constant is the time it takes for the capitator's charge to drop by 37%. This value is always equal to the capacitance x resistance


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    Is anyone struggling with EM induction??
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    How has everybody revised for this, have you made notes or have u done a ton of past papers since the questions repeat?
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    (Original post by ryandaniels2015)
    How has everybody revised for this, have you made notes or have u done a ton of past papers since the questions repeat?
    Both


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    (Original post by cosmicapple)
    Yep, they've been attached
    Do you or anyone have the June 2015 empa papers (phya6x) with mark scheme. I'll give rep
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    (Original post by Euclidean)
    Our teacher usually asks us to 'Describe an experiment to determine....' in his tests, and I suspect that these are past exam questions. Though I haven't yet looked at any past papers so I couldn't say for sure.

    I think we could be asked to describe an experiment as a high mark question (4+) in the exam

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    Won't they only ask about the required practicals, for this year? Are those the only practicals that can come up in the exam?
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    Can someone direct me to the PA04 Jan 2008 Paper B? I can't find it


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    (Original post by ComradeLenin)
    Can someone direct me to the PA04 Jan 2008 Paper B? I can't find it


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    Here you go:

    http://freeexampapers.com/index.php?...-2450/2008-Jan
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    Thank you!


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    Anyone got the 2015 paper for this unit and unit 5?
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    (Original post by Euclidean)
    AQA Physics PHYA4 - 20th June 2016
    Official Exam Discussion Thread

    Time: 09:00am
    Duration: 1h 45m

    :elefant::danceboy::elefant::danceboy::elefant::danceboy::elefant::danceboy::elefant::danceboy:

    A thread for Physics 4 is long overdue, below I have listed a few links which I think may be useful for those sitting the exam this year:

    Physics and Maths Tutor:
    http://www.physicsandmathstutor.com

    Old Specification Papers and Mark Schemes:
    http://www.aqa.org.uk/subjects/scien...d-mark-schemes

    Past Grade Boundaries:
    Attachment 508015

    DrPhysicsA YouTube Videos:
    https://www.youtube.com/user/DrPhysicsA

    Other Useful YouTube Channels:
    https://www.youtube.com/channel/UCkZ...uxY86jKLU4Wqyw

    A Level Physics Online Videos (Including ISA/EMPA Skills):
    http://www.alevelphysicsonline.com/#!videos/c1p3t

    People who may be interested in this thread:

    Hello I have done some physics videos and other A level videos, could I be added to the list at the start ?

    The link to my channel; https://www.youtube.com/channel/UCnU...KnP6g/featured


    I have done a few quite interesting videos recently, Anyway Brilliant thread ! Thanks for starting this !... I found it really helpful




    Many thanks
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    Can anyone explain the differences between electric potential and electrical potential Energy

    I get confused between potential and potential energy, I cant get my head around it. Any help appreciated, thanks
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    (Original post by boyyo)
    Can anyone explain the differences between electric potential and electrical potential Energy

    I get confused between potential and potential energy, I cant get my head around it. Any help appreciated, thanks
    Electric potential is a property just of a field itself, whereas electric potential energy is a combined property of a field, a charge, and its position.

    You should know that the electrical potential energy E is equal to the charge Q times the potential V. The potential is, if you like, a more general form of energy - if you find it for a point in a field, then you can find the electrical potential energy for any charge at that point without much trouble at all.

    I've probably just made it even less clear :-P

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