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

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    can someone explain q6 and 7 to me please? http://filestore.aqa.org.uk/subjects...1-QP-JUN14.PDF

    and does anybody have any tips for this paper? im struggling on both mp and written sections for both units and given the time left im really starting to panic :ashamed: thanks
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    (Original post by n0cturnal)
    can someone explain q6 and 7 to me please? http://filestore.aqa.org.uk/subjects...1-QP-JUN14.PDF

    and does anybody have any tips for this paper? im struggling on both mp and written sections for both units and given the time left im really starting to panic :ashamed: thanks
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    Have you had a go at the summary questions as you go along the textbook for Nelson Thornes?

    Probably too late to do every single one (unless you power through them aha), but pick out topics you particularly struggle with and attempt the summary questions to get a good grounding


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    (Original post by CD223)
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    Have you had a go at the summary questions as you go along the textbook for Nelson Thornes?

    Probably too late to do every single one (unless you power through them aha), but pick out topics you particularly struggle with and attempt the summary questions to get a good grounding


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    i managed to work out q6 but thanks man! q8 has stumped me as well yeah haha i think i will got a week left but physics is ruining my motivation for everything else hey man you better get an A* you seem like you got this in the bag haha
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    (Original post by n0cturnal)
    i managed to work out q6 but thanks man! q8 has stumped me as well yeah haha i think i will got a week left but physics is ruining my motivation for everything else hey man you better get an A* you seem like you got this in the bag haha
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    Lol, I appreciate the kind words but to get an A* I need like 114 UMS in both exams

    Rather unlikely.


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    (Original post by CD223)
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    Lol, I appreciate the kind words but to get an A* I need like 114 UMS in both exams

    Rather unlikely.


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    i wish you 100% in both papers my friend ah silly me converting to m thanks man
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    (Original post by n0cturnal)
    i wish you 100% in both papers my friend ah silly me converting to m thanks man
    Appreciate that dude! It's AQA so who knows I struggled with the EMPA though which will let me down.

    That all being said, I need an A for uni, so that's the main thing I guess!


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    (Original post by CD223)
    Appreciate that dude! It's AQA so who knows I struggled with the EMPA though which will let me down.

    That all being said, I need an A for uni, so that's the main thing I guess!


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    are the empas weighted the same as the isas? 10% of the overall thing at a2? youll be fine man you seem like youve been practicing all year im sure your brain wont let you down now
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    (Original post by n0cturnal)
    are the empas weighted the same as the isas? 10% of the overall thing at a2? youll be fine man you seem like youve been practicing all year im sure your brain wont let you down now
    Yeah they are - exams are 40% (20% of the whole A level) each so they matter more :/


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    (Original post by CD223)
    Motors/charges moving in magnetic fields = left hand rule

    Generators/generating or inducing an emf = right hand rule


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    Have there been past papers using the right hand rule, I don't think I've ever used it 😳😳😳


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    does anyone have a list off all the definitions that we need to know??


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    Hey guys,
    Is it really true that you have to get above 19 marks in the multiple choice to get higher than a B, even if you get say full marks in the written answer section?
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    (Original post by gcsestuff)
    Have there been past papers using the right hand rule, I don't think I've ever used it 😳😳😳


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    I've used it once. Can't remember which paper though! If I come across it again il quote you.


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    (Original post by gcsestuff)
    does anyone have a list off all the definitions that we need to know??


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    In the first post you'll find a host of resources including mine and Lau14's revision notes. They include all the definitions you need to know.


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    (Original post by muyiwaaiyenuro)
    Hey guys,
    Is it really true that you have to get above 19 marks in the multiple choice to get higher than a B, even if you get say full marks in the written answer section?
    Well here are the boundaries:
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    Which suggest that's false, given the first section is 25 marks.


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    (Original post by muyiwaaiyenuro)
    Hey guys,
    Is it really true that you have to get above 19 marks in the multiple choice to get higher than a B, even if you get say full marks in the written answer section?
    No this isn't true. Marks from both papers are added up and you get a total out of 75


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    (Original post by CD223)
    I've used it once. Can't remember which paper though! If I come across it again il quote you.


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    Thanks and thanks for that link. Determined to bag all the easy marks!


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    (Original post by gcsestuff)
    Thanks and thanks for that link. Determined to bag all the easy marks!


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    Probably sensible haha. Section B I find harder.


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    (Original post by CD223)
    Yes, if you think about it, the function \omega t in the third equation gives you the angle the coil has turned through relative to the initial point.

    Taking the sine of this angle gives you the component of the peak EMF induced when the coil rotates at an angle theta to the normal of the coil face.

    Hope that helps!


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    Do we have to change the equation depending on the initial point? (e.g. if the coil is parallel to the field initially rather than perpendicular?
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    (Original post by CD223)
    Probably sensible haha. Section B I find harder.


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    I agree, some questions I just look at and I have no idea how to start them, so they take a bit more thinking about. With multiple choice least you always know where to start and you can always get rid of a few answers


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    (Original post by 000alex)
    Do we have to change the equation depending on the initial point? (e.g. if the coil is parallel to the field initially rather than perpendicular?
    No because the angle is always the angle subtended between the normal to the coil face and the field lines. The only thing you need to watch out for is if you're not given this angle, but instead are given 90 minus it


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