Verified answer

I see that no one is helping you on this. I don't have time to do the math for you, but you can find the method here:

http://en.wikipedia.org/wiki/Magnetic_susceptibili...

alongside concentric circles around the cord. it should be because a immediately cord least complicated has a magnetic section round itself revolving in concentric circluar paths. The procedure the magnetic container is reachable to address:- develop the thumb of your acceptable hand in the approach the present contained in the immediately cord and see that the curved direction or direction the position your fingers on the breaking point of form a fist element out the direction the position the magnetic problem may we revolving. that is termed the right hand thumb rule or the maxwell's corkscrew rule because it basically depicts a corkscrew moving both in (at the same time as your thumb good factors downward) or out( at the same time as the thumb factors upward).