Why do we put the dot multiplication symbol when integrating

  • #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
 

Answers and Replies

  • #2
SteamKing
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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
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.

https://en.wikipedia.org/wiki/Gauss's_law
 
  • #3
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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.
The scalar product that SteamKing mentions is also called the "dot product."
 
  • #4
Ah!! Thank you! That really clears it up!
 

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