A proton moves in a helical path at speed v= 5.10 x 107 m/s high above the atmosphere, where Earth's magnetic field has magnitude B = 3.80 x 10-6 T. The proton's velocity makes an angle of 25.0° with the magnetic field. The mass of the proton is 1.673x10-27 kg. Find the radius of the helix. km
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