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Past exam of the physics 2 paper of the University of Oxford / 2013 resit / 1 / ii / Solution

Codex (@codex,  0) ... Year 1 of the physics course of the University of Oxford Physics 2 paper of the University of Oxford Past exam of the physics 2 paper of the University of Oxford 2013 resit 1 ii
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The instantaneous power delivered by the magnetic field is
dtdW​=F⋅v=q(v×B)⋅v=0.
(1)
Therefore W=0​ over any part of the orbit. The magnetic force changes direction of motion but leaves the speed and kinetic energy constant.

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