Maxwell equation, magnnetic induction field question?

[coffeem]

Homework Statement

Using "del cross B = u0J to deduce the magnetic induction field inside a long straight circular coil with 1000 turns per meter, carrying a current of 1A.

Homework Equations

Included in the question?

The Attempt at a Solution

I am struggling with this, it is the second (although self contained) part to another question. A tip would be enormously appretiated. Thanks

 

[coffeem]

anyone? please...

 

[negitron]

Perhaps this Wiki article will help get you started:

http://en.wikipedia.org/wiki/Ampère's_circuital_law

 

[coffeem]

Hey thanks for replying. I have looked at that wiki article... and I am still too thick to work out what I have to do... Can someone please give me a more substantial hint? Thanks

 

[Cyosis]

There are a few things you should look at. First of symmetry can you tell me by using symmetry in which direction the B-field will point? Secondly can you find a contour such that you can apply Ampere's law easily?

 

[coffeem]

There are a few things you should look at. First of symmetry can you tell me by using symmetry in which direction the B-field will point? Secondly can you find a contour such that you can apply Ampere's law easily?

I know it will be going in circles around the coil. But I can't think of any contours... I am majorly missing something here.

 

[Cyosis]

No the magnetic field will not be going in circles around the coil, how did you get to this answer?

For clarification. We are talking about a solenoid here right?