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Q9: A vector field $D=a_{R}\left(\cos ^{2} \phi\right) / R^{3}$ exists in the region between two spherical shells defined by $R=2$ and $R=3$. Evaluate (a) $\oint$ D. ds , and (b) $\int \boldsymbol{\nabla} . \mathbf{D} d v$

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