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    I got D which is wrong and I cant see why. working below.

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     eQv = \frac{mv^{2}}{r}

     eQ = \frac{mv}{r}

     \frac{eq}{m} = \omega = \frac{2\pi}{T}

     T = \frac{2\pi m}{eQ}
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    I think you are right

    Why do you think it's wrong?
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    (Original post by phys981)
    I think you are right

    Why do you think it's wrong?
    Mark scheme says its B. I think I am right actually because I've done multiple choice b4 and the mark schemes are all over the place.

    here's the page: http://www.physicsandmathstutor.com/...aqa/section-7/

    go to: question by topic--> aqa set 1 --> charges in magnetic fields.
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    You are definitely right. I have even seen another question asking for the thing in D to be proved or derived. MS must be wrong - to be fair I think that's probably easy to do when you're taking MC questions from a variety of sources.
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    (Original post by phys981)
    You are definitely right. I have even seen another question asking for the thing in D to be proved or derived. MS must be wrong - to be fair I think that's probably easy to do when you're taking MC questions from a variety of sources.
    alright, Ty for clarifying as I thought I went full idiot.
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