Question: External work equal to 4 1 0 - 7 J is needed to move a - nC charge at constant speed to a point at

External work equal to 410-7J is needed to move a -nC charge at constant speed to a point at which the ential is -20 V . What is the potential at the initial point?
External work equal to 4 1 0 - 7 J is needed to

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