- #1

Seraph404

- 64

- 0

## Homework Statement

For some reason, I'm not quite understanding this scenario.

"

Two hemispherical surfaces, 1 and 2, of respective radii r

_{1}and r

_{2}, are centered at a point charge and are facing each other so that their edges define an annular ring (surface 3), as shown. The field at position [tex]\vec{r}[/tex] due to the point charge is:

[tex]\vec{E}[/tex]([tex]\vec{r}[/tex])= [C/(r^2)]*[tex]\hat{r}[/tex]

where C is a constant proportional to the charge, r=|[tex]\vec{r}[/tex]|, and [tex]\hat{r}[/tex]=[tex]\vec{r}[/tex]/r is the unit vector in the radial direction. "

I'm supposed to find electric flux through the three different surfaces, but for some reason, this picture just doesn't make sense to me.

## Homework Equations

Electric flux is the integral of the dot product of electric field and dA (differential area element).

## The Attempt at a Solution

I want to try figuring it out on my own first before I ask for help, but I don't quite understand this scenario. For example, I don't understand how the two images provided correlate, and I don't understand what the three different surfaces are. Sorry if the answer to this is obvious. ><