Homework Answers
10.
using conservation of energy
electric potential energy of Q3 at A = electric potential energy of Q3 at B + kinetic energy
kQ1Q3/r + k Q2 Q3/r = kQ1Q3/r' + k Q2 Q3/r' + (0.5) m v2
k (Q1 + Q2) Q3/r = k (Q1 + Q2) Q3/r' + (0.5) m v2
(9 x 109) ((1.8 x 10-6)+ (1.8 x 10-6)) (4.4 x 10-6)/0.064 = (9 x 109) ((1.8 x 10-6)+ (1.8 x 10-6)) (4.4 x 10-6)/0.1 + (0.5) (13 x 10-6) v2
v = 351.24 m/s
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