1.

For the functional IL(v, ) Iv(v)+ c G(v)dxdy, what is the necessary condition for IL to have a stationary value?

A. <sub>v<sub>x</sub></sub>I<sub>L</sub>+ <sub>v<sub>y</sub></sub>I<sub>L</sub>+ <sub> </sub>I<sub>L</sub>=0
B. <sub>v<sub>x</sub></sub>I<sub>L</sub>- <sub>v<sub>y</sub></sub>I<sub>L</sub>- <sub> </sub>I<sub>L</sub>=0
C. <sub>v<sub>x</sub></sub>I<sub>L</sub>- <sub>v<sub>y</sub></sub>I<sub>L</sub>+ <sub> </sub>I<sub>L</sub>=0
D. <sub>v<sub>x</sub></sub>I<sub>L</sub>+ <sub>v<sub>y</sub></sub>I<sub>L</sub>- <sub> </sub>I<sub>L</sub>=0
Answer» B. <sub>v<sub>x</sub></sub>I<sub>L</sub>- <sub>v<sub>y</sub></sub>I<sub>L</sub>- <sub> </sub>I<sub>L</sub>=0


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