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physics: moving charges in magnetic field

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

Spoiler



eQv=mv2r eQv = \frac{mv^{2}}{r}

eQ=mvr eQ = \frac{mv}{r}

eqm=ω=2πT \frac{eq}{m} = \omega = \frac{2\pi}{T}

T=2πmeQ T = \frac{2\pi m}{eQ}
Reply 1
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phys981
10
I think you are right

Why do you think it's wrong?
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/physics-revision/a-level-aqa/section-7/

go to: question by topic--> aqa set 1 --> charges in magnetic fields.
Reply 3
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phys981
10
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.
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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