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139. Which requires the greatest amount of work to move an electrical charge?
     
A. Moving along equipotential lines. Moving an electrical charge along equipotential lines does not require any work.  

Moving an electrical charge perpendicular to equipotential lines requires the greatest amount of work.

The Correct Answer is D.

B. Moving at 30o to equipotential lines.
C. Moving at 60o to equipotential lines.
D. Moving perpendicular to equipotential lines.