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. $\mathbf{F}(x, y, z)=\mathbf{i}+2 \mathbf{j}+z \mathbf{k}$

    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.
$\mathbf{F}(x, y, z)=\mathbf{i}+2 \mathbf{j}+z \mathbf{k}$
Calculus
Calculus
James Stewart 7th Edition
Chapter 16, Problem 16 ↓

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The vector field is given by \(\mathbf{F}(x, y, z) = \mathbf{i} + 2\mathbf{j} + z\mathbf{k}\). This means that at any point \((x, y, z)\) in \(\mathbb{R}^3\), the vector field has components \((1, 2, z)\).  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. $\mathbf{F}(x, y, z)=\mathbf{i}+2 \mathbf{j}+z \mathbf{k}$
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Key Concepts

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3D Vector Fields
A 3D vector field assigns a vector to every point in three-dimensional space. Each vector is described by its three components along the x, y, and z axes, providing both magnitude and direction at each point. Understanding the structure of a vector field is crucial to interpreting its behavior and how it varies throughout space.
Constant versus Variable Components
When analyzing a vector field, it is important to distinguish between components that remain constant and those that vary with position. In a field where some components are constant and one or more depend on a spatial coordinate, the field exhibits uniform behavior in some directions while changing in others. This mix can affect the overall geometry of the field and how it is visualized.
Cross-Sectional Analysis of Vector Fields
Examining the behavior of a vector field along slices or cross-sections—by fixing one coordinate and studying the resulting two-dimensional field—helps in understanding its structure. For fields with variable components, the appearance of the field may change dramatically from one cross-section to another, a key idea when matching analytical forms with graphical representations.
Graphical Representation and Matching of Vector Fields
Matching the analytical description of a vector field to its graphical depiction relies on understanding how the field's constant and variable parts manifest visually. Recognizing patterns such as parallel translations, variations along an axis, and changes in magnitude or direction across different regions helps in correctly associating the field with its plot.

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Match the vector fields $F$ with the plots labeled I-IV. Give reasons for your choices. $$ \mathbf{F}(x, y)=\langle y, y+2\rangle $$

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