- #1
karine
- 1
- 0
Homework Statement
draw equipotential lines and electric field lines for the following arrangements of charges:
a) +4 at (3,5)
b) +4 at (3,5) and +4 at (6,5)
c) +4 at (3,5) and -4 at (6,5)
d) +5 at (3,5) and -2 at (6,5)
e) +4 at (3,4), (7,4), and (7,7)
f) +4 at (3,4) and (7,4) and -4 at (3,7) and (7,7)
h) +4 at (3,4),(7,4), and (5,8)
#1: find the places in the arrangements from a-f where electric field strength is zero. show your work. State the x,y coordinate where the electric field strength is zero
#2: find the places in each arrangement where the electric potential is zero. show your work.
Homework Equations
e = [itex]\frac{k|q|}{r^{2}}[/itex]
V = [itex]\frac{kq}{r}[/itex]
The Attempt at a Solution
First of all, my teacher directed me to this applet thing to see what the equipotential and electric field lines would look like, which is this:
http://www.cco.caltech.edu/~phys1/java/phys1/EField/EField.html
so I tried to plot the points and I saved each one as a picture. With this: "draw equipotential lines and electric field lines", show I use the pictures or draw them completely new on separate graph paper?
for #1 for arrangement B, I figured because of the distance the place would be in the middle of the two charges, so at (4.5,6), but I have no idea how I could prove this with any of the equations I've learned. If I use e = k |q| / r^2, and sub in e for 0 and try to find r, I get 189 736.66 :S
I also don't understand how using e = k |q| / r^2 incorporates the fact that there are two charges.
I realize that's not a lot of work done on my own, but I really don't understand what I'm supposed to be doing at all.
This is at a grade 12 level.