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12_Ch 16 College Physics ProblemCH16 Electrical Energy and Capacitance

12_Ch 16 College Physics ProblemCH16 Electrical Energy and Capacitance

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46 CHAPTER 16 (b) ( )( ) 2 12 9 9 2 7 9 2 5.00 10 C 3.00 10 C N m 8.99 10 3.85 10 J C 0.350 m e i q r × × = × = − × k q PE = The negative sign means that positive work must be done to separate the charges (that is, bring them up to a state of zero potential energy). 16.16 The potential at distance from a charge Q is 0.300 m r = 9 9.00 10 C = + × ) 9 2 2 8.99 10 N m C 9.00 10 0.300 m e k Q V r × × = = 9 C 270 V = + 9 10 C Thus, the work required to carry a charge from infinity to this location is 3.00 q = × ( ) ( ) 9 7 8.09 10 J = × 3.00 10 C 270 V W qV = = × + ( )( 16.17 The Pythagorean theorem gives the distance from the midpoint of the base to the charge
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