# B Why do we put the dot multiplication symbol when integrating

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1. May 29, 2016

### Jatin Kaushal

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?

2. May 29, 2016

### SteamKing

Staff Emeritus
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. May 29, 2016

### Staff: Mentor

The scalar product that SteamKing mentions is also called the "dot product."

4. May 30, 2016

### Jatin Kaushal

Ah!! Thank you! That really clears it up!