46CHAPTER 16 (b) ()( )2129927925.0010C3.0010CNm8.9910 3.8510JC0.350meiqr−−−×−×⋅=×=−×kqPE=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 Qis 0.300 mr=99.0010C−=+×)9228.9910 N mC9.00100.300 mekQVr−×⋅×==9C270 V=+910C−Thus, the work required to carry a charge from infinity to this location is 3.00q978.0910J=×3.0010C270 VWqV×+( )(16.17The Pythagorean theorem gives the distance from the midpoint of the base to the charge
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