Earth’s magnetic field A cross section of Earth’s magnetic field can be represented as a vector field in which the center of Earth is located at the origin and the positive y-axis points in the direction of the magnetic north pole. The equation for this field is F ( x , y ) = M ( x , y ) i + N ( x , y ) j = m ( x 2 + y 2 ) 5 / 2 [ 3 x y i + ( 2 y 2 − x 2 ) j ] where m is the magnetic moment of Earth. Show that this vector field is conservative.
Earth’s magnetic field A cross section of Earth’s magnetic field can be represented as a vector field in which the center of Earth is located at the origin and the positive y-axis points in the direction of the magnetic north pole. The equation for this field is F ( x , y ) = M ( x , y ) i + N ( x , y ) j = m ( x 2 + y 2 ) 5 / 2 [ 3 x y i + ( 2 y 2 − x 2 ) j ] where m is the magnetic moment of Earth. Show that this vector field is conservative.
Solution Summary: The author explains that the Earth's magnetic field m(x2+y2)fric52, is conservative.
A cross section of Earth’s magnetic field can be represented as a vector field in which the center of Earth is located at the origin and the positive y-axis points in the direction of the magnetic north pole. The equation for this field is
F
(
x
,
y
)
=
M
(
x
,
y
)
i
+
N
(
x
,
y
)
j
=
m
(
x
2
+
y
2
)
5
/
2
[
3
x
y
i
+
(
2
y
2
−
x
2
)
j
]
where m is the magnetic moment of Earth. Show that this vector field is conservative.
Quantities that have magnitude and direction but not position. Some examples of vectors are velocity, displacement, acceleration, and force. They are sometimes called Euclidean or spatial vectors.
The figure shows an overhead view of a 0.026 kg lemon half and two of the three horizontal
forces that act on it as it is ona frictionless table. Force F has a magnitude of 3 N and is at
e, - 31. Force F2 has a magnitude of 10 N and is at 02- 33". In unit-vector notation, what is the
third force if the lemon half (a) is stationary, (b) has the constant velocity V (131-14) m/s,
and (c) has the V = (12i – 14ij) m/s?, where t is time?
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The figure shows an overhead view of a 0.026 kg lemon half and two of the three horizontal
forces that act on it as it is ona frictionless table. Force F has a magnitude of 3 N and is at
8, -31. Force F2 has a magnitude of 10 N and is at 02 33". In unit-vector notation, what is the
third force if the lemon half (a) is stationary, (b) has the constant velocity V= (137-14) m/s,
%3D
%3D
and (c) has the V =
(12fi - 14) m/s?, where t is time?
Represent the line segment from P to Q by a vector-valued function. (P corresponds to t = 0. Q corresponds to t = 1.)
P(-9, -2, -1), Q(−4, −8, −9)
r(t) =
Represent the line segment from P to Q by a set of parametric equations. (Enter your answers as a comma-separated list of equations.)
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