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75.
(a) The ﬂux over the loop cross section due to the current
i
in the wire is given by
Φ=
Z
a
+
b
a
B
wire
ldr
=
Z
a
+
b
a
µ
0
il
2
πr
dr
=
µ
0
il
2
π
ln
µ
1+
b
a
¶
.
Thus,
M
=
N
Φ
i
=
Nµ
0
l
2
π
ln
µ
1+
b
a
¶
.
(b) From the formula for
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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
 SPRUNGER
 Physics, Current

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