A particle of mass 0.195 g carries a charge of -2.50 * 10-8 C. The particle is given an initial horizontal velocity that is due north and has magnitude 4.00 * 104 m/s. What are the magnitude and direction of the minimum magnetic field that will keep the particle moving in the earth’s gravitational field in the same horizontal, northward direction?

A particle of mass 0.195 g carries a charge of -2.50 * 10-8 C. The particle is given an initial horizontal velocity that is due north and has magnitude 4.00 * 104 m/s. What are the magnitude and direction of the minimum magnetic field that will keep the particle moving in the earth’s gravitational field in the same horizontal, northward direction?

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