Area=S
S is a rectangular (see image linked) surface, it is not a circle.
S would be the Area of a rectangular of base R and height=length of wire (infinite)
Along a wire (of radius r) a current i is crossed from one.
Calculate the magnetic flux through the surface S, inner to the wire.
http://img138.imageshack.us/my.php?image=cilindrodb4.jpg
I think
\phi_b= \int B dS= BS
B=\mu_0 i/2\pi r
How to calculate S if I have not the length of wire...
Ehm, yes,some trouble with google translator :)
"dinanzi"= in front
If you want, edit my first message. Thanks
My problem is that I do not succeed to take advantage of the various measures of two slits.Usuallly I have only worked with one interference slit.
I creed that in reality is from...
My reasoning is:
Ri=Internal radius
Re=External radius
E int= 1/4\pi\epsilon_0 * Q/Ri^2
E ext= 1/4\pi\epsilon_0 * Q1/Re^2
and then use
V=\int E dl
What do you think?
edit
I correct something
A charge punctiform of Q= 12*10\exp-6 C is in the center of a spherical shell conductor charged negatively Q1= 6*10\exp-6 C, and of internal radius = 22 cm ad external=26 cm.
Calculate the electric field and potential.
Ok, Thanks for the answer.
Another thing.
If there is a sphere centered at the origin, with radius R, the Flux is zero?
I think that is similar to cube example!
http://img153.imageshack.us/my.php?image=cubeqq7.jpg
What do you think?
Bye
Hello, if we have an electric field E parallel to X axis and a semisphere with axis parallel to X axis, which is the electric flux through the semisphere?