Posted by Justin on Tuesday, May 1, 2012 at 9:43pm.
Three point charges, +6.7e6, +2.5e6, and 3e6, lie along the xaxis at 0 cm, 2.4 cm, and 5.7, repectively.
What is the force exerted on q1 by the other two charges? (to the right is positive) . The coulomb constant is 8.99*10^9 N*m^2/C^2
What is the force exerted on q2 by the other two charges?
What is the force exerted on q3 by the other two charges?
Answer in units of N

Physics  Elena, Wednesday, May 2, 2012 at 7:38am
x1=0.024 m, x2 =0.057 m
F12= k•q1•q2/x1² (to the left),
F13 = k•q1•q3/x2² (to the right),
F1 = F12 – F13 ( if F1>0 to the left, if F1<0 to the right)
F21= k•q1•q2/x1² (to the right),
F23 = k•q2•q3/(x2x1)² (to the right),
F2 = F21 + F23 (to the right)
F31= k•q1•q3/x2² (to the left),
F32 = k•q2•q3/(x2x1)² (to the left),
F2 = F31 + F32 (to the left)
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