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Unformatted text preview: 1 Physics 2102 Gabriela Gonzlez You bring a charge of 3C from infinity to a point P on the perpendicular bisector of a dipole as shown. Is the work that you do: a)Positive? b)Negative? c)Zero? a Q +Q 3C P 2 What is the electric potential at the center of each circle? Potential is a SCALAR All charges are equidistant from each center, hence contribution from each charge has same magnitude: V +Q has positive contribution Q has negative contribution A: 2V+3V = +V B: 5V+2V = 3V C: 2V+2V = 0 A C B Q +Q Note that the electric field at the center is a vector, and is NOT zero for C! Divide the charge distribution into differential elements Write down an expression for potential from a typical element  treat as point charge Integrate! Simple example: circular rod of radius R, total charge Q; find V at center. dq R 2 What is the electric potential at the center of each circle? Potential is a SCALAR All charges are equidistant from each center, hence contribution from each charge has same magnitude: V +Q has positive contribution Q has negative contribution A: 2V+3V = +V B: 5V+2V = 3V C: 2V+2V = 0 A C B Q +Q Note that the electric field at the center is a...
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This note was uploaded on 05/20/2011 for the course PHYS 2102 taught by Professor Gimmnaco during the Fall '08 term at LSU.
 Fall '08
 GIMMNACO
 Physics, Charge, Electric Potential, Work

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