lecture6

# lecture6 - Physics 2102 Jonathan Dowling Physics 2102...

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Electric Potential II Electric Potential II Physics 2102 Jonathan Dowling Physics 2102 Physics 2102 Lecture 6 Lecture 6

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Example Example Positive and negative charges of equal magnitude Q are held in a circle of radius R. 1. What is the electric potential at the center of each circle? V A = V B = V C = 2. Draw an arrow representing the approximate direction of the electric field at the center of each circle. 3. Which system has the highest electric potential energy ? –Q +Q A C B k +3 Q - 2 Q ( ) / r = + kQ / r = i i i r q k V k +2 Q - 4 Q ( ) / r = - 2 kQ / r k + 2Θ - 2Θ ( 29 / ρ= 0 B
Electric Potential of a Dipole (on axis) Electric Potential of a Dipole (on axis) ( ) ( ) 2 2 Q Q V k k a a r r = - - + What is V at a point at an axial distance r away from the midpoint of a dipole (on side of positive charge)? a r -Q +Q ( ) ( ) 2 2 ( )( ) 2 2 a a r r kQ a a r r V V + - - = - + ) 4 ( 4 2 2 0 a r Qa - = πε 2 0 4 r p = Far away, when r >> a: V

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Electric Potential on Perpendicular Bisector of Dipole Bisector of Dipole You bring a charge of Q o = –3C from infinity to a point P on the
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## This note was uploaded on 11/18/2011 for the course PHYSICS 2102 taught by Professor Dowling during the Fall '10 term at LSU.

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lecture6 - Physics 2102 Jonathan Dowling Physics 2102...

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