A particle (m = 3.0 ?g, q = 5.0 ?C) moves in a uniform magnetic field given by (
) mT. At t = 0 the velocity of the particle is equal to (
) m/s. The subsequent path of the particle is
A. circular with a 50-cm radius.
B. helical with a 6.3-cm pitch.
C. circular with a period of 31 ms.
D. helical with a 40-cm radius.
E. none of the above
Answer: D
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