Course Conteres» » HW #8-due suN 1a/29 at 11pm , forer_rum-three-charges,Jine_vN

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Course Conteres» » HW #8-due suN 1a/29 at 11pm , forer_rum-three-charges,Jine_vNC-Problem Three point charges are arranged in a horizontal une as shown below Find the electre forces Cn units ofiq1R, on the changes gven the folowing: Qi--2Q,Qr . 2Q,Q-260n-2R,andn-1R. Remember that a positive force points to the right and a negative force points to the left What is the net force on charge Qu Submit Answer Tries 0/2 What is the net foroce on charge Qa What is the net force on charge a Aner Tries 2 what is the sn, of the forces 0n aa darges? Send Feedback 2 Post 4 6

Explanation / Answer

F1 = - k Q1 Q2 / r1^2 - k Q1 Q3 / (r1 + r2)^2

F1 = - k (-20Q)(2Q)/4 R^2 - k (-20Q)(36Q)/(2R+ R)^2

F1 = 40 k Q^2 / R^2 + 80 k Q^2 / R^2

F1 = 120 k Q^2 / R^2 .......Ans

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F2 = KQ1 Q2 / r1^2 k Q2 Q3 / r2^2

F2 = - 40 k Q^2 / R^2 - 72 k Q^2 / R^2 = - 112 k Q^2 / R^2

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F3 = k Q1 Q3 / (r1 + r2)^2 + k Q2 Q3 / (r2^2)

F3 = - 80 + 72 = - 8 k Q^2 / R^2

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F = F1 + F2 + F3 = 0

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