Let F(r, y) = (2re-")i+ (2y – x²e=v)j. (a) Show there exists a function f(r, y) such that Vf = F. (b) Find f(x, y) such that Vf = F. (c) Calculate 2.re "dx + (2y – ²e")dy where C is the unit octagon centered at the origin, oriented clockwise.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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The problem involves a vector field and requires demonstrating the existence of a potential function, finding this potential function, and evaluating a line integral over a specific path.

2. Let \(\mathbf{F}(x, y) = (2xe^{-y})\mathbf{i} + (2y - x^2 e^{-y})\mathbf{j}\).

Tasks:

(a) **Existence of a Potential Function**: Demonstrate that there exists a function \(f(x, y)\) such that the gradient \(\nabla f = \mathbf{F}\).

(b) **Finding the Potential Function**: Determine the function \(f(x, y)\) such that \(\nabla f = \mathbf{F}\).

(c) **Evaluate the Line Integral**:
   \[
   \oint_C 2xe^{-y}dx + (2y - x^2 e^{-y})dy
   \]
   where \(C\) represents the unit octagon centered at the origin, with a clockwise orientation.

Note: This task involves understanding vector calculus concepts like potential functions and line integrals, and applying them in the context of the given vector field.
Transcribed Image Text:The problem involves a vector field and requires demonstrating the existence of a potential function, finding this potential function, and evaluating a line integral over a specific path. 2. Let \(\mathbf{F}(x, y) = (2xe^{-y})\mathbf{i} + (2y - x^2 e^{-y})\mathbf{j}\). Tasks: (a) **Existence of a Potential Function**: Demonstrate that there exists a function \(f(x, y)\) such that the gradient \(\nabla f = \mathbf{F}\). (b) **Finding the Potential Function**: Determine the function \(f(x, y)\) such that \(\nabla f = \mathbf{F}\). (c) **Evaluate the Line Integral**: \[ \oint_C 2xe^{-y}dx + (2y - x^2 e^{-y})dy \] where \(C\) represents the unit octagon centered at the origin, with a clockwise orientation. Note: This task involves understanding vector calculus concepts like potential functions and line integrals, and applying them in the context of the given vector field.
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