GATE ME 2017 Set 2 — Question 26
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Engineering Mathematics → Vector Calculus → Gauss Divergence Theorem
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Question
The surface integral over the surface of the sphere , where and is the unit outward surface normal, yields _________
Correct answer
225 to 227
Solution
By Gauss's Divergence Theorem, the surface integral of a vector field over a closed surface is equal to the volume integral of its divergence over the volume enclosed by :Given the vector field:The divergence is calculated as:The surface is a sphere , which has a radius . The volume enclosed by the sphere is:Substituting these into the divergence theorem formula:Taking :The value rounded to two decimal places is 226.19, which falls within the specified range of 225 to 227.
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