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OCR Physics B G495 Field and Particle Pictures June 21st 2011 Exam Thread watch

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    (Original post by 41jms)
    difference between slip ring and split commutators anyone?
    anyone??
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    (Original post by 41jms)
    difference between slip ring and split commutators anyone?
    Split ring = used for DC motors, slip ring = AC motors. A split ring is, as per the name, in "two halves" so that it helps change the polarity every half turn.

    Slip rings usually come in a pair for AC, with one ring attached to one end of the coil; the AC does the polarity changing itself.

    If anyone wants to clear up a few more bits that I've missed out, have at it!
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    Good luck all, lets hope for a nice paper.
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    (Original post by Swindan)
    Not sure, I realised I haven't covered quarks and leptons yet, so I'm trying to give half my focus to that, and half to the pre-release. I might just go through the answers to those pre-release questions, and see what formulas and methods could come up, rather than working my way through it.

    It's okay... I've completely missed out binding energy...
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    Ahhh! The day of judgement is upon us... Good luck to everyone, lets hope it goes well.

    :goodluck:
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    Good luck people.
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    good luck everyone!!
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    GL everyone, lets hope OCR B doesn't go wild.
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    Section C is gonna be crap...

    i just know it
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    ahhh going to be lateee for this exam:eek:
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    1st question !!
    for the two capacitors , what was the voltage across the 1.5 microfarad capacitor ? was it 1.5 volts or 4.5 volts?
    Physics A (sorry)
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    That paper was an absolute joke. Can you believe they made a mistake in the paper? Again, after D1?

    Edit: Sorry, wrong paper. I did A...
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    (Original post by supercal35)
    1st question !!
    for the two capacitors , what was the voltage across the 1.5 microfarad capacitor ? was it 1.5 volts or 4.5 volts?
    I got 4.5 volts cos charge has to be the same (I think...)
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    It was a rather nice paper, hope everyone would agree...
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    (Original post by yutinai_ti)
    It was a rather nice paper, hope everyone would agree...
    Very happy with that paper! Section C wasn't even that bad... :eek:
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    (Original post by supercal35)
    1st question !!
    for the two capacitors , what was the voltage across the 1.5 microfarad capacitor ? was it 1.5 volts or 4.5 volts?
    You're in the wrong thread, dude.


    (Original post by yutinai_ti)
    It was a rather nice paper, hope everyone would agree...
    It was actually! A few slightly "eh" moments like the 4-marker with the beta source and the plates (because I'm not that brill with that bit ), but you gotta admit, that wasn't a ruthless paper at all. ^^

    Touch wood for good grades? ^^
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    (Original post by arianex)
    You're in the wrong thread, dude.
    What's the right thread?
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    T'was alright. Though, for some of the questions in Section C, I just didn't have a clue what they wanted me to write.
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    the section a and b are easy..except for the last question on section b..didnt know how to do that.. section c was hard in some 2 mark questions
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    One of the first questions confused me a little
    first it asked why the particles path is curved in the magnetic field, then another question asking why it was a spiral... :confused:
    Aren't they basically the same question?
    I just said the force is perpendicular to velocity (etc) for both xD
 
 
 
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