lecture9 - 1 Electric Potential (II) Text sections 25.3,...

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Unformatted text preview: 1 Electric Potential (II) Text sections 25.3, 25.5 Potential of a point charge Potential of several point charges Potential energy of a collection of charges Practice: Chapter 25, problems 11, 17, 23, 29 Review: Electric Potential Review: Electric Potential charge energy potential V So, ds E =- = q qdV dW dx dV E x- = ds E =- dV 2 What is the electric potential near a point charge Q? What is the electric potential near a point charge Q? +Q r r Q k E e 2 = r Move another charge q in the field: its potential energy changes as the field does work. q A B - =- =- B A r r A B q V V q ds E ) ( work) ( ) ( ... then cancel q on each side. Details: Move from A to B along a radial line, Q A B dr r ds = r r A r B dr r Q k Edr dV e 2 = = =- ds E dr r Q k dV B A r r e B A - = 2 - + =- A B e A B r r Q k V V 1 1 3 Set V=0 as r b Then r Q k V e = (potential around a single point charge Q) What shape are the equipotential sufaces near a...
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lecture9 - 1 Electric Potential (II) Text sections 25.3,...

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