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B Why do we put the dot multiplication symbol when integrating

  1. May 29, 2016 #1
    This is I think a really dumb question, but I never got it, why do we have that dot symbol when we integrate. Like in gauss's law, we have ∫E⋅dA . why is that ⋅ there?

    Thank you for your help
  2. jcsd
  3. May 29, 2016 #2


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    Staff Emeritus
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    You are integrating two vector quantities. The dot is there to indicate the scalar product of the electric field E and the infinitesimal bit of surface area dA.

  4. May 29, 2016 #3


    Staff: Mentor

    The scalar product that SteamKing mentions is also called the "dot product."
  5. May 30, 2016 #4
    Ah!! Thank you! That really clears it up!
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