A Circular Disk, S, of Radius 2 and Centered on an Axis

question 38

Multiple Choice

A circular disk, S, of radius 2 and centered on an axis, is perpendicular to the y-axis at y = -6 with normal in the direction of decreasing y. Consider the vector field $\vec { F } = x \vec { i } + y \vec { j } + ( z + x ) \vec { k }$ .Is the flux integral $\int_{S} \vec{F} \cdot \overrightarrow{d A}$ positive, negative or zero?

• A)Positive
• B)Zero
• C)Negative

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Definitions:

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