Question

Match the vector fields $\mathbf{F}$ on $\mathbb{R}^3$ with the plots labeled I-IV. Give reasons for your choices. GRAPH CAN'T COPY. $\mathbf{F}(x, y, z)=x \mathbf{i}+y \mathbf{j}+3 \mathbf{k}$

    Match the vector fields $\mathbf{F}$ on $\mathbb{R}^3$ with the plots labeled I-IV. Give reasons for your choices. GRAPH CAN'T COPY.
$\mathbf{F}(x, y, z)=x \mathbf{i}+y \mathbf{j}+3 \mathbf{k}$
Calculus
Calculus
James Stewart 7th Edition
Chapter 16, Problem 17 ↓

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The vector field is given by \(\mathbf{F}(x, y, z) = x \mathbf{i} + y \mathbf{j} + 3 \mathbf{k}\). This means that at any point \((x, y, z)\) in \(\mathbb{R}^3\), the vector field has components \(x\) in the \(x\)-direction, \(y\) in the \(y\)-direction, and a  Show more…

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Match the vector fields $\mathbf{F}$ on $\mathbb{R}^3$ with the plots labeled I-IV. Give reasons for your choices. GRAPH CAN'T COPY. $\mathbf{F}(x, y, z)=x \mathbf{i}+y \mathbf{j}+3 \mathbf{k}$
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Key Concepts

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Vector Field
A vector field in three-dimensional space assigns a three?dimensional vector to every point in R³. It is a function that maps each (x, y, z) to a vector, and it is an essential concept in multivariable calculus and physics for describing quantities that have both magnitude and direction at each point in space.
Components of a Vector Field
Every vector field is composed of its individual scalar component functions along the i, j, k directions. In the given case, the field F(x,y,z) has an x-component (x), a y-component (y), and a z-component (3), meaning that while the horizontal (x, y) components vary with position, the z-component is constant, which influences how the field will look in a plot.
Decomposition into Linear and Constant Parts
The vector field can be seen as the sum of a linear (or radial) part and a constant part. The (x i + y j) term represents a radially outward field in the xy-plane, whose magnitude increases with distance from the origin, whereas the constant vertical term (3 k) adds a uniform upward shift to every vector. This decomposition allows one to understand and anticipate the directional behavior in the field’s graph.
Graphical Interpretation of Vector Fields
When matching a vector field to its graphical representation, one must look at both the direction and magnitude of vectors. In this case, the graph should show vectors that, in the horizontal plane, point away from the origin with increasing magnitude, coupled with a uniform upward vertical component. Recognizing these patterns—radial spread in the xy-directions and constant vertical displacement—is key to matching the correct plot.

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2. Match the vector fields F with the plots labeled I - IV: (a) F(x,y,z) = i + 2j + 3k (b) F(x,y,z) = i + 2j + zk (c) F(x,y,2) = xi + yj + 3k (d) F(x,y,2) = xi + yitzk

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