A particle of mass 6 x 105 kg and charge 3 μC moves downward from point A to point B a distance of 5 m in the earth's gravita- tional field. The kinetic energy of the particle decreases by 4.1 mJ during this movement. What is the potential difference VB - VA? The acceleration of gravity is 9.8 m/s². Answer in units of kV. 2
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