1.

The figures show diagrammatic representations of vector fields \(\vec X,\;\vec Y,\;and\;\vec Z\) respectively. Which one of the following choices is true?

A. \(\nabla .\vec X = 0,\nabla \times \vec Y \ne 0,\nabla \times \vec Z = 0\;\)
B. \(\nabla .\vec X \ne 0,\nabla \times \vec Y = 0,\nabla \times \vec Z \ne 0\)
C. \(\nabla .\vec X \ne 0,\nabla \times \vec Y \ne 0,\nabla \times \vec Z \ne 0\)
D. \(\nabla .\vec X = 0,\nabla \times \vec Y = 0,\nabla \times \vec Z = 0\)
Answer» D. \(\nabla .\vec X = 0,\nabla \times \vec Y = 0,\nabla \times \vec Z = 0\)


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