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

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    (Original post by Bealzibub)
    How do you do this please help:

    Answer is C


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    Can someone define tesla


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    Yeah it helped!
    Thanks again!!!
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    (Original post by Bealzibub)
    Need help on this too..

    Change in potential is = -30V

    work done = e * (-30V) = -30eV and force towards Y.

    answer is A.. how?

    force is not towards Y, the answers is out of A and D.

    the force is away from Y OR Towards X because an electron is negative and the 100V plate is +
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    (Original post by gcsestuff)
    The answer to this is zero? Attachment 424513
    I still don't understand


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    Because all forces are equal and equidistant so they cancel out
    Correct me someone if I'm wrong
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    (Original post by gcsestuff)
    Can someone define tesla


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    F = BIL

    therefore, B = F/IL

    > N A^-1 m^-1

    force per current per metre.
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    (Original post by CD223)
    I agree! What grade are you aiming for?


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    As high as possible, I need a B in physics overall, so the higher this is, the less pressure I have next week. What are you going for?


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    (Original post by Kennethm)
    I got C, not sure what the right answer is though.
    The answer in the mark scheme is zero. There's a few diagram with different charges. I'll take a photo to explain
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    When do you use the Right hand rule?
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    (Original post by gcsestuff)
    Can someone define tesla


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    The magnetic flux density of a magnetic field that causes a force of 1N to act on a current of 1A in a wire of length 1m which is perpendicular to the magnetic field.

    That was from a previous paper I think or the AQA text book. It's "wordy" unfortunately but quite simple at heart.
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    (Original post by Sumz.96)
    When do you use the Right hand rule?
    For force induced due to the motor effect? I believe


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    (Original post by gcsestuff)
    Can someone define tesla


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    one weber per square metre,
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    (Original post by gcsestuff)
    The answer to this is zero? Attachment 424513
    I still don't understand




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    If you were to draw the field lines for each of the charges, then there would be a point in the centre where the field lines would repel.
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    (Original post by Sumz.96)
    When do you use Right hand rule?
    When you're moving say a bar through a magnetic field. This induces a current. The same fingers still apply and the force is what the person is doing to it so say a person pulls a bar up with a magnetic field into the page an induced current will be induced going right.

    Is to do with lenzs law which is - the direction of induced emf opposes the change that created it.

    So using both the left hand and right hand rules we can see that if a bar in pushed one way a magnetic force will act in the opposite direction.

    I think this is right


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    (Original post by Klaxoii)
    As high as possible, I need a B in physics overall, so the higher this is, the less pressure I have next week. What are you going for?


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    Makes sense! Need an A


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    ugh just come out of a chemistry exam. head's that mashed I don't even know where to start with physics 4 revision tonight.
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    DOn't mean to be a pain but how did you get from 100 to 800? Thanks
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    I need 46/75 going of last years boundaries to get my c in physics (all I need) so prayin


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    Can someone list what happens when you travel along field lines, along lines of equal potential, etc for electric and magnetic fields?
    I don't really get the work done thing/ force on particle in these situations
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    (Original post by Klaxoii)
    Answer is C


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    Thanks, only just saw it now, weird it didn't come in my notifications
 
 
 
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