lec03 - The change in electric potential encountered by the...

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Electric Potential Energy A charged object, when placed in an electric field, experiences a electric force. This force can cause the object to move and thereby does work on it. The work done by the electric force on the object as it moves from location A to location B is defined to be the difference in the object’s Electric Potential Energy ( EPE ) between A and B. The change in the object’s EPE is Electric Potential Energy is analogous to gravitational potential energy Recall the work done by the gravitational force on an object is defined as the difference in the object’s gravitational potential energy. B A AB EPE EPE W = AB A B W EPE EPE EPE = = ) ( A B E q F r r = E q F r r = q q Electric field lines
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Electric Potential The quantity EPE/q at a given location is defined as the electric potential ( V ) at that location.
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Unformatted text preview: The change in electric potential encountered by the object (with charge q ) as it moves from A to B is Since W AB /q>0, it follows that V B V A <0 . Electric field lines points from regions of high potential ( V A ) to regions of low potential ( V B ) A positive charge accelerates in the direction of the electric field, i.e. from a region of high potential toward a region of low potential. A negative charge accelerates in the direction opposite to the direction of the electric field, i.e. from a region of low potential toward a region of high potential. q W q EPE q EPE V V V AB A B A B = = q EPE V Unit of V : volt (=J/C) V A ( high ) A B E q F r r = E q F r r = q q V B ( low ) Electric field lines...
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lec03 - The change in electric potential encountered by the...

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