A particle of mass 0.195 g carries a charge of -2.50 X 10^- 8 C. The particle is given an initial horizontal velocity that is due north and has magnitude 4.00 X 10^ 4 m/s. What are the magni- tude and direction of the rninirnum magnetic field that will keep the particle moving in the earth's gravitational field in the same horizontal, northward direction?
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UP 0 DOWN 0 0 0
