HR24_post - Register your iclicker The following 10...

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Register your iclicker • The following 10 iclickers are not registered yet 1032F4D6, 1056ABED, 10AF72CD, 15B68625, 19513179, A17BFA2, A27DFF2, AADF255, BAB44E4, FF1CD33 1 • Check if the one is yours and register asap
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Chapter 24 Electric Potential • Define the electric potential ( symbol V ) of an electric field • Calculate – Potential V if we know the corresponding electric field E – Electric field E if we know the corresponding potential V • Determine potential V generated by – Point charge 2 – Discreet charge distribution – Continuous charge distribution • Determine electric potential energy U of a system of charges • Define the notion of an equipotential surface • Explore the geometric relationship between equipotential surfaces and electric field lines • Explore the potential of a charged isolated conductor
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• We can assign an electric potential energy U to a system of two or more charged particles exerting electrostatic forces on each other • If the system changes its configuration from an initial state i to a different final state f , the electrostatic force does work W on the particles . The resulting change in the potential energy of the system is W U U U i f - = - = Electric Potential Energy 3 • It has been found out experimentally that an electric force is a conservative force • As for all conservative forces, the work done by the electrostatic force is path independent : – Suppose a charged particle moves from point i to point f while an electrostatic force acts on it. The work done by the force on the particle is the same for all paths between points i and f
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• As a reference configuration , we usually take the configuration when all particles are separated at infinitely large distances from one another. The corresponding reference potential energy is set to zero • Suppose that several charged particles come closer from initially infinite separations ( state i ) to form a system of neighboring particles ( state f ). W is the work done by the electrostatic forces between the particles during the move in from infinity. Then we can write Electric Potential Energy (cont’d) 4 W U U i f - = - - = - W U 0 - = W U Thus the potential energy U of the system is negative of the work done by the electrostatic force to bring the system of particles from infinity (reference configuration) to the current configuration • It is important to remember that an electric potential energy is associated with a system of particles as a whole
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• Introduce potential energy per unit charge, called electric potential q U V = • Electric potential is a scalar quantity . It is a characteristic of the electric field at a given point • Electric potential difference V between any two points i and f in an lectric field is: Electric Potential b Independent of charge 5 Since U = W , the formula becomes electric field is: q U q U q U V V V i f i f = - = - = q W V - = The potential difference between two points is the negative of the work done by the electrostatic force to move a unit charge from one point to the other
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This document was uploaded on 11/04/2011 for the course PHY 108 at SUNY Buffalo.

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HR24_post - Register your iclicker The following 10...

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