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Electrostatics problem

  1. Oct 21, 2015 #1
    1. The problem statement, all variables and given/known data
    A point charge e is braught near a spherical conductor of radius "a" having a charge "q".show that the particle will be repelled by the sphere unless its distance from the nearest point of its surface is less than (a/2) *√(e/q) approximately?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 21, 2015 #2
    please help me with this
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