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A Point Charge?

  1. Jul 10, 2010 #1
    Why do we take a point charge always while estimating the electric field intensity of a system of charge? as in Coulomb's and Gauss's Law etc.
  2. jcsd
  3. Jul 10, 2010 #2
    That is how electric field is defined.
    The electric field of a system of charges at some point is the force that would be exerted on a unit positive (point) charge at that point.
  4. Jul 10, 2010 #3
    As we can have many different types of surfaces, therefore we consider a point charge in our most examples. Because, this is what we say in Electric field, we consider one part of it while defining it
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