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Charges of three long charged cylinders centered on 1 axis

  1. Oct 24, 2016 #1
    • Thread moved from the technical forums, so no Homework Help Template is shown.
    The figure shows a section of three long charged cylinders centered on the same axis. Central cylinder A has a uniform charge qA= +3q0.
    What are the charges of qb and qc if E is 0 on point >
    a) 1 ( between A & B )
    b) 2 ( between B & C )
    c) 3 ( out side the cylinders )
    My solutions were based on the concept of vectors
    a) qB= +3q0, qC= -6q0
    b) qB= +3q0, qC= +6q0
    c) That's impossible. ( the other choices were impossible )
    But they were wrong.
    Could you explain what's wrong with my solutions ?
     

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  3. Oct 24, 2016 #2
    I got a) impossible , b)qB= -3q0, qC= +3q0 c) qB= +3q0, qC= -6q0 > They are right. :)
     
    Last edited: Oct 24, 2016
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