Potential energy = q V
PEi = q Vi = (6uC)(60V) = 3.6 x 10^-4 J
PEf = qVf = (6 x 10^-6 C) (35V) = 2.1 x 10^-4 J
(A) change in PE = PEf - PEi = - 1.5 x 10^-4 J
in eV = (-1.5 x 10^-5 / (1.6 x 10^-19))ev
= - 9.37 x 10^14 eV
(minus sign shows that PE decreases)
(B) Energy conservation,
PEi + KEi = PEf + KEf
3.6 x 10^-4 + 0 = 2.1 x 10^-4 + (2 x 10^-6)v^2/2
(1 x 10^-6) v^2 = 1.5 x 10^-4
v = 12.25 m/s
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