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Let F=2i5j+4k\vec { F } = - 2 \vec { i } - 5 \vec { j } + 4 \vec { k }

question 18

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Let F=2i5j+4k\vec { F } = - 2 \vec { i } - 5 \vec { j } + 4 \vec { k } , and let S1 be a horizontal rectangle with corners at (0,0,1), (0,2,1), (3,0,1)and (3,2,1), oriented upward; S2 a rectangle parallel to the xz-plane, with corners at (1,3,1), (2,3,1), (1,3,5)and (2,3,5), oriented in the positive y-direction, and S3 a rectangle parallel to the yz-plane, with corners at (1,2,1), (1,4,1), (1,2,5)and (1,4,5), oriented in the negative x-direction.
Arrange S1FdA\int _ { S _ { 1 } } \vec { F } \cdot \overrightarrow { d A } , S2FdA\int_{S_{2}} \vec{F} \cdot \overrightarrow{d A} and S3FdA\int _ { S _ { 3 } } \vec { F } \cdot \overrightarrow { d A } in ascending order.


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