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How much work does the electric field do in moving a -7.7 `muC` charge from ground to a point where potential is +55 V higher? 

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The potential difference between the two points, or voltage `Delta V,`is defined as the work it would take to move a positive unit charge from the first point to the second, AGAINST the electric force provided by the field. Note that the work in this definition is done by some...

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