# Find the flux through a surface S (Electromagnetic Theory)

## Homework Statement

A point charge q1 is located on the y-axis at r1= a (Y_hat) and another q2 located at the mirror point r2= -a (Y_hat). The charges are not necessarily the same sign or magnitude. Now consider the circular surface S of radius a contained in the x-z plane through the origin. Take the normal vector to this surface to point along the positive y-axis.

a.) Find the flux of the electric field through S.
b.) Use Mathematica to plot the field lines in the y-z plane through the origin for the following three cases: q2=-10q1, q2=q1, and q2=10q1.

## Homework Equations

I have no idea how to start this problem or how to plug it into mathematica

## The Attempt at a Solution

vela
Staff Emeritus
Homework Helper
You need to show some effort at trying to solve the problem yourself before receiving help. This is pretty basic stuff. What's the field of a point charge? What's the definition of flux?

Flux= EA cos(theta)= E.A
I got flux = q/4e0

I don't have experience using mathematica at all

You need to show some effort at trying to solve the problem yourself before receiving help. This is pretty basic stuff. What's the field of a point charge? What's the definition of flux?
Sorry for that. This one. I think I may have over thought it a bit.

vela
Staff Emeritus