Vector Analysis: $\varphi$, $\mathbf{v}$, and Their Cross Products

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SUMMARY

The discussion focuses on the vector analysis involving the scalar field $\varphi = F_1h_1$ and the vector field $\mathbf{v} = \frac{\unit{u}_1}{h_1}$. It establishes that the curl of the vector field, represented as $\varphi\nabla\times\mathbf{v}$, equals zero, while the expression $\nabla\varphi\times\mathbf{v}$ does not. The variables $F_1$ and $h_1$ are identified as position-dependent, while $\hat{\mathbf{u}}_1$ is treated as a constant in this context.

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  • Understanding of vector calculus, specifically curl and gradient operations.
  • Familiarity with scalar and vector fields in physics and mathematics.
  • Knowledge of notation and symbols used in vector analysis, such as $\nabla$ and cross product.
  • Basic principles of field theory and their applications in physics.
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  • Study the properties of curl and divergence in vector fields.
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$\newcommand{\unit}[1]{\hat{\mathbf{#1}}}$
Let $\varphi = F_1h_1$ and $\mathbf{v} = \frac{\unit{u}_1}{h_1}$.
Why is $\varphi\nabla\times\mathbf{v} = 0$ but $\nabla\varphi\times\mathbf{v}$ not?
 
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Of the symbols $F_{1}$, $h_{1}$, and $\hat{\mathbf{u}}_{1}$, which are variable, depending on position, and which are constant?
 

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