The question asks to
a) Calculate the total electrostatic potential energy
b) Calculate the work required (by external forces) to transport Q3 from its location on the figure to infinity.
a)
r12=5.00m, r13= 3.00m, r23=sqrt[5.00^2+3.00^2) = 5.83 m
Ui= kQ1Q2/r12 + kQ1Q3/r13 + kQ2Q3/r23=(9*10^9*-4.00*10^-6*-5.00*10^-6)/(5.00) + (9*10^9*-4.00*10^-6*4.00*10^-6)/(3.00) + (9*10^9*-5.00*10^-6*4.00*10^-6)/(5.83) = -0.043 j
b)
Uf = kQ1Q2/r12 + kQ1Q3/r13 + kQ2Q3/r23=(9*10^9*-4.00*10^-6*-5.00*10^-6)/(5.00) + (9*10^9*-4.00*10^-6*4.00*10^-6)/(∞) + (9*10^9*-5.00*10^-6*4.00*10^-6)/(∞) = 0.036 j
ΔU = Uf - Ui = - W
W= -ΔU = Ui – Uf =-0.043-0.036 = -0.079 J
The question asks to a) Calculate the total electrostatic potential energy b) Calculate the work required...
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