1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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 ?

    Attached Files:

    • 1.jpg
      File size:
      5.2 KB
  2. jcsd
  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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted