Question: A uniform magnetic field points vertically upward; its magnitude is 0.800 T. An electron with kinetic energy 7.2 1018 J is moving horizontally eastward

A uniform magnetic field points vertically upward; its magnitude is 0.800 T. An electron with kinetic energy 7.2 × 10−18 J is moving horizontally eastward in this field. What is the magnetic force acting on it?

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