{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
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.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Ask a homework question - tutors are online