Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 16 - Vector Calculus - 16.3 The Fundamental Theorem for Line Integrals - 16.3 Exercises - Page 1135: 19



Work Step by Step

The vector field $F(x,y)=ai+bj$ is known as conservative field throughout the domain $D$, when we have $\dfrac{\partial a}{\partial y}=\dfrac{\partial b}{\partial x}$ $a$ and $b$ represents the first-order partial derivatives on the domain $D$. From the given problem, we get $\dfrac{\partial a}{\partial y}=\dfrac{\partial b}{\partial x}=-2xe^{-y}$ Thus, we have the vector field $F$ is conservative. Consider $f(x,y)=x^2e^{-y}+g(y)$ $ \implies f_y(x,y)=-x^2e^{-y}+g'(y)$ and $g(y)=k$ This implies that $f(x,y)=x^2e^{-y}+k$ Thus, $\int_C F \cdot dr =f(2,1)-f(1,0)=(1+4e^{-1}+k)-(1+k)=\dfrac{4}{e}$
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