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Homework Help: Block carrying a charge on a frictionless horizontal track

  1. Nov 15, 2009 #1
    1. The problem statement, all variables and given/known data

    A 4.00 kg block carrying a charge Q=50.0 µC is connected to a spring for which k=100N/m (see diagram). The block lies on a frictionless horizontal track, and the system is immersed in a uniform electric field of magnitude E = 5.00x10^5 V/m, directed as shown. If the block is released from rest when the spring is unstretched (at x = 0), (a) by what maximum amount does the spring expand? (b) What is the equilibrium position of the block?

    See attached MS Word Document for diagrams / further information. Thanks!

    Attached Files:

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    Last edited: Nov 15, 2009
  2. jcsd
  3. Nov 15, 2009 #2
    I think at equilibrium pos, electric force is equal to restoring force. And this pos should be a max amount that spring expands because there is no other force. :-?
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