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 99 2 7 9 2 5.00 10 C 3.00 10 C Nm 8.99 10 3.85 10 J C0 . 3 5 0 m ei q r −− ×− ×  = ×   kq 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 =+ × ) 92 2 8.99 10 N m C 9.00 10 0.300 m e kQ 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 97 8.09 10 J = × 3.00 10 C 270 V Wq V × + ( )( 16.17 The Pythagorean theorem gives the distance from the midpoint of the base to the charge
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