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Planck const
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Homework Statement
First I have to say that my English isn't good:)
Ok..
There is a cylinder that at him, there is hole.
Cylinder radius is "a" and the hole radius is "b"
The distance from the cylinder center to the hole center is "d".
The current density is "J", in the hole there is nothing.
What is the field inside the hole?
Why the answer is 2PiJd/c in the book (CGS), why the field in it is constant(by heart the book) ?
Homework Equations
Amper rule?
The Attempt at a Solution
I can look in this quesion, like all the cylinder got +J and the hole - -J.
So I choose the positive direction in the direction of the J in hole.
I can use Amper rule:
B*P(hole) = mu0*J*A(hole)
So:
B*2pir=mu0*J*pir^2
B=mu0*Jr/2
Why the gave me a,d,b ? In the hole there is variable field!
Thanks in advance
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