**Unformatted text preview: **Chapt. 25 Electric Potential 193 025 qmult 00430 1 2 1 moderate memory: potential enery for continuous charge 16. The general formulae for the potential energy for a localized set of point charges and a localized continuous distribution of charge are, respectively, PE = 1 2 summationdisplay i q i V i and PE = 1 2 integraldisplay ρ ( vector r ) V ( vector r ) dvector r . The 1 / 2 factor prevents: a) double counting. b) undercounting. c) random counting. d) triple counting. e) rash counting. 025 qmult 00440 1 2 1 moderate memory: potential energy for continuous charge 17. Say you had localized continuous charge distribution with total charge Q and characteristic length ℓ . The potential energy of the distribution is approximately: a) kQ 2 ℓ . b) kQ ℓ . c) kQ 2 ℓ 2 . d) kQ ℓ 2 . e) k 2 Q 2 ℓ . 025 qmult 00500 1 1 4 easy memory: dipole potential 18. The far-field electric potential of an electric dipole is V = kvectorp · ˆ r r 2 , where vector p is the , ˆ r is a unit vector pointing the direction to the position where the...

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