A particle with charge q and momentum p is moving in the horizontal plane under the action of a uniform vertical magnetic field of magnitude B. Measurements are made of the particle's trajectory to determine the “sagitta” s and half-chord length l, as shown in the figure above. Which of the following expressions gives the particle's momentum in terms of q, B, s, and l? (Assume s ≪ l).
A. qBs2/2l
B. qBs2/l
C. qBl/s
D. qBl2/2s
E. qBl2/8s
(GR9677 #89)
Solution:
Answer: D
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