(a) A cosmic ray proton moving toward Earth at 5.00×107m/s5.00×107m/s experiences a magnetic force of 1.70×10−16N1.70×10−16N. What is the strength of the magnetic field if there is a 45∘45∘ angle between it and the proton’s velocity?
(b) Is the value obtained in part a. consistent with the known strength of Earth’s magnetic field on its surface? Discuss.