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MasteringPhysics: HWe5- Google Chrome Secure l https://session.masteringphysics.com/myct/itemView?assignmentProblemID-80194562&offsetsnext; H Problem 28.5 previous | 6019 | ned Problem 28.5 Part A What is the electric potenial energy of the proton in the figure? The electrons are fixed and cannot move. Assume that r 0.52 nm and d 2.5 nm. (Fiqure 1 Express your answer to two significant figures and include the appropriate units. 2.13 10-19J Submit My Answers GiveUp ncorrect, Try Again; 5 attempts remaining Continue of 1 Proton Elections 12:17 PM 41)7/28/2017 ^

Explanation / Answer

The distance from electron to proton is L = sqrt(d^2+r^2) = sqrt(2.5^2+0.52^2)*10^-9 = 2.55*10^-9 m

let q1 and q2 are the charges on proton and electron respectievly

q1 = 1.6*10^-19 C and q2 = -1.6*10^-19 C

Uelectron = (k*q1*q2/L)+(k*q1*q2/L) = 2*k*q1*q2/L = (-2*9*10^9*(1.6*10^-19)^2)/(2.55*10^-9) = -1.807*10^-19 J

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