A particle of mass 0390 g carries a charge of 200 x10-8 c, Ask an Expert

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A particle of mass 0.390 g carries a charge of 2.00 x10^-8 C. The particle is given an initial horizontal velocity that is due west and has a magnitude 7.00 x 10^4 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, westward direction? Magnitude T Direction northward eastward westward southward

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