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GR9677 #89
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Alternate Solutions |
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Comments |
kroner 2009-10-12 07:23:56 | An equivalent way to find R is to see that and for some small angle . First order approximations for small are and , so then . |  | iostream 2009-08-14 21:32:19 | easier way:
if the particle's momentum is very large, then the magnetic field's influence will be negligible - that is, it will move as if it were in a straight line. thus, the momentum should diverge as s approaches 0, from which we eliminate all choices except D and E. then, you realize the binomial approximation is never going to introduce a factor of 8, so the answer is (D). |  | askewchan 2008-11-06 19:41:29 | Also, we can eliminate (A) and (B) because we know that a larger implies greater acceleration which means lower momentum. The same goes for a smaller .
In other words, if the particle has great momentum the radius of this arc will be larger, which gives a greater and lesser . |  | cordercom 2008-10-05 18:23:40 | At the very least we can eliminate choice (C) by units. |  |
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