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Homework Help: What does this symbol stand for?

  1. Dec 5, 2004 #1

    Thats 4pi (backwards 3 0) R squared.

    I forget what the backwards 3 o stands for can someone help me out
  2. jcsd
  3. Dec 5, 2004 #2


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    [itex]\epsilon_0[/itex]? Permeability of free space. (Or is it permittivity? I always forget which)
  4. Dec 5, 2004 #3


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    [itex] \epsilon _0 [/itex] is known as the permittivity of free space and is equal to about [itex]8.85~
    *~ 10^{-12}~~ F/m [/itex]

    It is a proportionality constant relating the electric displacement vector to the field strength.

    OR, it can be thought of as a constant connecting electric field (or force) to the values of charge and distance.
    Last edited: Dec 5, 2004
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