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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

[tex]\phi_b= \int B dS= BS[/tex]

[tex]B=\mu_0 i/2\pi r[/tex]

How to calculate S if I have not the length of wire?

The solution of the problem is

[tex]\phi_b=\mu_0 i /4\pi[/tex]

Calculate the magnetic flux through the surface S, inner to the wire.

http://img138.imageshack.us/my.php?image=cilindrodb4.jpg

I think

[tex]\phi_b= \int B dS= BS[/tex]

[tex]B=\mu_0 i/2\pi r[/tex]

How to calculate S if I have not the length of wire?

The solution of the problem is

[tex]\phi_b=\mu_0 i /4\pi[/tex]

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