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Unformatted text preview: 77. For x > 20 mm, the ﬁeld due i2 is downward and thus subtracts from B1 and is entirely consistent with
the given expression for B2 (note that it becomes negative when x > d). Similarly, for x < −20 mm, the
ﬁeld due to i1 is downward and subtracts from B2 (which is positive and points upward for all x < d).
This again is consistent with the expression for B1 which is seen to become negative for x less than −d
(that is, x negative and |x| > |d|). We conclude that the given expressions are valid over the whole of the
x axis, and their answer (Eq. 30-33) holds for all x (other than at the locations of the wires themselves,
where it becomes problematic, as discussed in the Sample Problem). ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
- Fall '08