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A positive 1.5 x 10-9 C charge is brought in from infinity to a point (2m,0)....

A positive 1.5 x 10-9 C charge is brought in from infinity to a point (2m,0). How much work did you do to move the charge to this position? W =

Now another positive charge 1.5 x 10-9 C is moved from infinity to the coordinates (1m,2m). How much additional work did you do to bring in the second charge? (The original charge is held in place.) W =

Finally, a negative 1.5 x 10-9 C charge is moved from infinity to the coordinates (-2m,0). How much additional work did you do to bring in the third charge? (The original two charges are held in place.) W =

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