Find the flux due to a vector crossing an open surface

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    Flux Surface Vector
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SUMMARY

The discussion centers on calculating the flux due to a vector field crossing an open surface, specifically examining the vector field defined as ## \bf A = rz~ \hat {\bf \theta} ##. The participant asserts that the curl of this vector field, calculated as ## \nabla \times \bf A ##, results in ## (z/r)~ \hat {\bf k} - \hat {\bf r} ##, which contradicts an unspecified reference. This discrepancy raises questions about the fields involved and their definitions.

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falyusuf
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Homework Statement
Attached below.
Relevant Equations
Attached below.
Question:
1646434170915.png

Equations:
1646434303623.png

My attempt:
1646434736987.png


Could someone confirm my answer please?
 
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If ## \bf A = rz~ \hat {\bf \theta} ##
then ## \nabla \times \bf A = (z/r)~ \hat {\bf k} - \hat {\bf r} ##
and not what is given.
Different fields ??
 

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