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Magnetic field, coaxial cable

  1. Nov 3, 2014 #1
    Hi. In this task we're asked to calculate the magnetic field inside the small cylinder (0>r>r1). The answer is zero, which I don't quite understand...Here is the picture:

    As the picture shows there's a current I going through the inner cylinder. Wouldn't this current generate a magnetic field at a distance 0 >r>r1?
  2. jcsd
  3. Nov 3, 2014 #2
    From the shading it looks like the inner conductor is a cylindrical shell rather than a solid, in which case there will be no inside magnetic field.

    If it's a solid conductor the magnetic field will increase linearly with r.
  4. Nov 3, 2014 #3
    Ok, thanks. So the current "flows" along the cylindrical shell? I.e inside the shell we don't enclose any current.
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