Discussion
In cylindrical coordinates the element of volume is
Answer: D
Cylindrical coordinates are plane polars with \( z \) carried along unchanged, so the plane element \( r\,dr\,d\theta \) is simply multiplied by the height:
\[ dV \;=\; r\,dr\,d\theta\,dz. \]
The form with \( r^{2}\sin\phi \) is the spherical element, where both angles are true angles and two factors of length are needed to convert them
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