Homework Answers
a) E = V/d = 400/(55*10^-3) = 7272.72 V = 7.272 kV
b) Force F = q*E = 2.5*10^-9*7272.72 = 1.818*10^-5 N
C) Work done is W = q*dV = 2.5*10^-9*400 = 1*10^-6 J
d) W = -dU
change in potential energy is dU = -W = - 1*10^-6 J
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