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Chapter 19 Notes

# Chapter 19 Notes - When work WAB is done by an electric...

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When work W AB is done by an electric force as a posi-tive test charge + q 0 moves from point A to point B , the work equals the electric potential energy EPE at A minus that at B : W AB = EPE A - EPE B . The electric potential V is the electric potential energy per unit charge, V = EPE/ q 0 . The electric potential difference between two points is V B - V A = (EPE B - EPE A )/ q 0 = - W AB / q 0 . A positive charge accelerates from a region of higher potential toward a region of lower potential. Conversely, a negative charge accelerates from a region of lower potential toward a region of higher potential. The electric potential at a distance r from a point charge q is V = kq / r . This expression for V assumes the potential is zero at an infinite distance away from the charge. The electron volt (eV) is a unit of energy. One electron volt corresponds to 1.60×10 -19 J and is the amount by which the potential energy of an electron changes when the electron moves through a potential difference of one volt.
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