A cosmic ray proton moving toward the Earth at 4.80 x 107 m/s experiences a magnetic force of 5.90 x 10-16 N.
(a) What is the strength of the magnetic field if there is a 30o angle between it and the proton’s velocity?
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(b) What is the magnetic field from (a) as a percentage of the observed magnetic field of the Earth, BE = 5.5 x 10-5 T?