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49.
(a) The magnitude of the magnetic dipole moment is given by
µ
=
NiA
,whe
re
N
is the number of
turns,
i
is the current in each turn, and
A
is the area of a loop. In this case the loops are circular,
so
A
=
πr
2
,where
r
is the radius of a turn. Thus
i
=
µ
Nπr
2
=
2
.
30A
·
m
2
(160)(
π
)(0
.
0190 m)
2
=12
.
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 Fall '08
 SPRUNGER
 Physics, Current

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