Calculus 8th Edition

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

Chapter 16 - Vector Calculus - 16.5 Curl and Divergence - 16.5 Exercises - Page 1149: 10

Answer

a) Positive b) CurlF is zero.

Work Step by Step

(a) Let us consider that $F=Pi+Qj$, then we have $divF=\dfrac{∂P}{∂x}+\dfrac{∂Q}{∂y}$ we can see that when $\dfrac{∂P}{∂x}$ is positive, since the $x$ components of the vectors increases in length, as we move along the positive $x-direction$ and $\dfrac{∂Q}{∂y}$, is positive, since the $y$ components of the vectors increases in length, as we move along the positive $y-direction$. This yields that the divergence is positive. (b) Let us consider that $F=Pi+Qj$, then we have $divF=\dfrac{∂P}{∂x}+\dfrac{∂Q}{∂y}$ This implies that $curlF=(\dfrac{∂Q}{∂x}-\dfrac{∂P}{∂y})k=(0-0)k=0$ Hence, $curlF$ is zero.
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