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=====Introducing $d\Vec{r}$ (5 minutes)=====

Draw pictures of $\Vec{r}$ and $\Vec{r}$ + $d\Vec{r}$.  

**Student Conversations from Spring 2019**
  * $\vec r$ is a geometric object that points to a point from the origin.
    * $r_x=x \hat x$, $r_y=y \hat y$, and $r_z=z \hat z.$ These statements are unique for $\vec r$.
  * $r = |\vec r|$ 


Find $d\Vec r$ in rectangular coords.

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