class_10(Electrostatics_field)

# class_10(Electrostatics_field) - Electric potential...

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Electric potential Differential work Work needed to move charge from A to B Potential difference between A and B

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Absolute potential Absolute potential at an arbitrary point A: The absolute potential at location A is defined as the amount of work that must be done to move a unit charge from the infinity to location A - = A A l d E V Relationship between relative potential and absolute potential A B AB V V V - = Unless otherwise specified, we assume zero potential point is at inf!!!
Potential caused by a point charge Find potential at point A, the E-field is caused by a point charge at the origin = - = A A A l d E l d E V r a r Q E 2 0 4 1 πε = Which integration path should we take? dr a l d r = r Q dr a a r Q l d E r V A r r r A A 0 2 0 4 1 ) ( 4 1 ) ( = = =

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Potential caused by multiple charges Potentials are additive:
charge distribution

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## This note was uploaded on 03/30/2009 for the course ECE 335 taught by Professor Yifeili during the Fall '08 term at UMass Dartmouth.

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class_10(Electrostatics_field) - Electric potential...

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