23.18 Two stationary point charges +3 nC and + 2nC...

23.18
Two stationary point charges +3 nC and + 2nC are separated bya distance of 50cm. An electron is released from rest at a pointmidway between the two charges and moves along the line connectingthe two charges. What is the speed of the electron when it is 10cmfrom +3nC charge?
Besides the hints I'd like to ask you to give me numericalsolution so I can verify my answer later on. It would be nice ifyou could write it out, but a numerical anser would be fine alongwith the hint how to get there.
Thank you.
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    Answers ( 1 )

    1. viktor sauer
      viktor sauer
      from the diagram we can notice that the motion is along x-axis..
      xi = 25cm xf= 10cm

      Consider xi= 0 and the positve x-axis toward the 3nC charge , soxf=15 cm ..
      xf-xi = 15 cm
      F at this point equal to
      Claculate both forces and then ,
      when u get the acceleration u can get the velocity usingconstant acceleration motion equations ,
      Use :
      u know that the initial velocity is zero as long we assumedthe motion started from the origin
      and (xf-xi) = 15cm
      and the acceleration calculated previously ..

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