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47. (a) The field of a dipole along its axis is given by Eq. 3029:
B
z
=
µ
0
3
2
π
, where
is
the dipole moment and
z
is the distance from the dipole. Thus,
B
A
=
×⋅
×
×
=×
−−
−
41
0
1
5
1
0
2
30 10
72
3
6
π
π10 10
−9
Tm
JT
m
T.
ch
c
h
c
h
.
.
(b) The energy of a magnetic dipole
G
in a magnetic field
G
B
is given by
UB
B
=− ⋅ =−
G
G
µµ
φ
cos ,
where
is the angle between the dipole moment and the field. The energy required to
turn it endforend (from
= 0° to
= 180°) is
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Energy

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