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A proton of mass 1.67x10^27 kg, moves in a circle in the plane perpendicular to a uniform magnetic field of magnitude 1.8T. The radius of curvature is 3.0cm. what is the speed of the proton?
 2 years ago
 2 years ago
A proton of mass 1.67x10^27 kg, moves in a circle in the plane perpendicular to a uniform magnetic field of magnitude 1.8T. The radius of curvature is 3.0cm. what is the speed of the proton?
 2 years ago
 2 years ago

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NotTimBest ResponseYou've already chosen the best response.0
To speed things up, the equation is \[v=qBr/m\]
 2 years ago

NotTimBest ResponseYou've already chosen the best response.0
My only difficulty with this situation is the matter of "q". I don't know where the value comes from.
 2 years ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
q looks like the charge (in Coulombs perhaps?) of the proton, but i'm not entirely sure
 2 years ago

NotTimBest ResponseYou've already chosen the best response.0
I think you are correct. Q is the charge.
 2 years ago

NotTimBest ResponseYou've already chosen the best response.0
IF anyone ever comes: value of q still undetermined.
 2 years ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
If q is the charge, then in coulombs, the charge of a proton is q = 1.602 * 10^(19) C where C is the abbreviation of a coulomb
 2 years ago

JamesJBest ResponseYou've already chosen the best response.2
Yes, that's the charge of a proton. You can solve it now. Just make sure you use SI units throughout.
 2 years ago

NotTimBest ResponseYou've already chosen the best response.0
wait, so Q is a constant?
 2 years ago

JamesJBest ResponseYou've already chosen the best response.2
q is the charge of object you're interested in, which is a proton. And a proton most definitely has a fixed charge.
 2 years ago

NotTimBest ResponseYou've already chosen the best response.0
So this is knowledge I should have know already?
 2 years ago

JamesJBest ResponseYou've already chosen the best response.2
it doesn't seem like an unreasonable thing that you should.
 2 years ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
yeah it seems like they were assuming that you would have or should have known that
 2 years ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
but if you didn't, you can easily look it up
 2 years ago

NotTimBest ResponseYou've already chosen the best response.0
Ok. Thank you very much.
 2 years ago
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