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A very long cable made of a solid
O 31
inner cylinder and a coaxial, cylindrical, outer shell with
finite thickness. The inner cylinder carries a current I while
the outer shell carries a current 21 in the opposite direction
(see figure). What is the magnitude of the magnetic field at
H,31
b <r < c?
61
а.
2 +
-
2nr
H,31
2ur
H,31
1 + 2
_ 2
2tr
d.
H,31
1 - 2-
2nr
b.
C.
Transcribed Image Text:A very long cable made of a solid O 31 inner cylinder and a coaxial, cylindrical, outer shell with finite thickness. The inner cylinder carries a current I while the outer shell carries a current 21 in the opposite direction (see figure). What is the magnitude of the magnetic field at H,31 b <r < c? 61 а. 2 + - 2nr H,31 2ur H,31 1 + 2 _ 2 2tr d. H,31 1 - 2- 2nr b. C.
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