C A Thin Rod Of Length 21 * Problern 4.7 Part A How × MasteringPhysics: HW23-Goo

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C A Thin Rod Of Length 21 * Problern 4.7 Part A How × MasteringPhysics: HW23-Google Chrome Secure https://session.masteringphysics.com/myct/itemView?assignmentProblemID=78334939 HW23 Problem 23.54 Xavier Resources Course Materials « previous 13 of 15 next » Problem 23.54 Part A How much work must be done to bring three electrons from a great distance apart to within 2.8x10-10 m trom one another (at the comers of an equilateral triangle)? Express your answer using two significant figures. work = Submit My Answers Give Up Incorrect; Try Again; 5 attempts remaining Continue Print Assignment

Explanation / Answer

Work done = change in potential energy

W = (kq1q2 / r1 + kq2q3 / r2 + kq3q1 / r3)

= 9*10^9 * (1.6*10^-19*1.6*10^-19 / 2.8*10^-10 + 1.6*10^-19*1.6*10^-19 / 2.8*10^-10 + 1.6*10^-19*1.6*10^-19 / 2.8*10^-10)

= 2.46*10^-18 J

so work done = 2.46*10^-18 J

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