For any isolated electric charge, the electric potential is defined as zero at an infinite distance from the charge. *IV. For mechanics and thermodynamics equations, W represents the work done on a system. *Not on the Table of Information for Physics C, since Thermodynamics is not a Physics C topic. Electric Field and Motion. One important thing to be careful about is that you don't confuse electric fields with the motion of charges. If I release a positive test charge from rest at a position ...

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