A proton is moving at a speed of 3.2 × 106 m/s at an angle of 80° to a uniform magnetic field of strength 1.5 × 10-4 T. What is the distance moved by the proton along the spiral path as it completes one revolution? (This distance is called the "pitch" of the helix.)
A) 1370 m
B) 1390 m
C) 240 m
D) 220 m
E) cannot be determined
Correct Answer:
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