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Magnetism
151
19.22
The magnitude of the torque is
sin
NBIA
τ
θ
=
, where
is the angle between the field
and the perpendicular to the plane of the loop. The circumference of the loop is
22
.
0
0
r
m
π
=
, so the radius is
1.00 m
=
r
and the area is
1
m
Ar
==
.
Thus,
()
( )
32
3
1
0.800 T
17.0
10
A
m
sin90.0
4.33
10
N m
−−
=×
°
=
×
1
⋅
19.23
The area is
( )( )
2
0.200 m
0.150 m
0.094 2 m
Aa
b
ππ
=
90.0
. Since the field is parallel to the
plane of the loop,
=°
and the magnitude of the torque is
42
sin
8 2.00
10
T
6.00 A
0.094 2 m
sin90.0
NBIA
4
9.05
10
N m
−
−
=
°
=
×⋅
The torque is directed to make the lefthand side of the loop move toward you and the
righthand side move away.
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This document was uploaded on 10/20/2011.
 Spring '09
 Physics, Magnetism, Work

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