The differential equation of the family of curves \[v=\frac{A}{r}+B,\]where A and B are arbitrary constants, is

\[\frac{{{d}^{2}}v}{d{{r}^{2}}}+\frac{1}{r}\frac{dv}{dr}=0\]

\[\frac{{{d}^{2}}v}{d{{r}^{2}}}-\frac{2}{r}\frac{dv}{dr}=0\]

\[\frac{{{d}^{2}}v}{d{{r}^{2}}}+\frac{2}{r}\frac{dv}{dr}=0\]

The differential equation of the family of curves \[v=\frac{A}{r}+B,\]

1.	The differential equation of the family of curves \[v=\frac{A}{r}+B,\]where A and B are arbitrary constants, is
A.	\[\frac{{{d}^{2}}v}{d{{r}^{2}}}+\frac{1}{r}\frac{dv}{dr}=0\]
B.	\[\frac{{{d}^{2}}v}{d{{r}^{2}}}-\frac{2}{r}\frac{dv}{dr}=0\]
C.	\[\frac{{{d}^{2}}v}{d{{r}^{2}}}+\frac{2}{r}\frac{dv}{dr}=0\]
D.	None of these
Answer» D. None of these

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The differential equation of the family of curves \[v=\frac{A}{r}+B,\]where A and B are arbitrary constants, is

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