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wind wind
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7 years ago
Consider the cross section of a current carrying wire as shown below. The current is carried by the 2 gray sections (0<r<a,and  b<r<c).  The current, i = 10 mA, is in the direction out of the page, half of it flowing in the inner wire and half in the outer shell.
a)   Assuming that the 3 sections have the same thickness, i.e. (0a) ̅=(ab) ̅=(bc) ̅=1cm, calculate the magnetic field for 0<r<a,a<r<b,b<r<c, and r>c.  
(Hint: think Ampere’s Law)     [6 marks]
b)(2/10) Sketch the variation of B vs. r in the diagram below. [4 marks]
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