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For a position vector rm r = rm x hat i...

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Calculus
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For a position vector \[{\rm{r}} = {\rm{x\hat i}} + {\rm{y\hat j}} + {\rm{z\hat k}}\]    the norm of the vector can be defined as $$\left| {\overrightarrow {\text{r}} } \right| = \sqrt {{{\text{x}}^2} + {{\text{y}}^2} + {{\text{z}}^2}} .$$     Given a function $$\phi = \ln \left| {\overrightarrow {\text{r}} } \right|,$$   its gradient $$\nabla \phi $$  is

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Correct Answer: Option C
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