If r be position vector of any point on a sphere and a, b are respectively position vectors of the extremities of a diameter, then [MP PET 1994]

\[\mathbf{r}\,.\,(\mathbf{a}-\mathbf{b})=0\]

\[\mathbf{r}\,.\,(\mathbf{r}-\mathbf{a})=0\]

\[(\mathbf{r}+\mathbf{a})\,.\,(\mathbf{r}+\mathbf{b})=0\]

\[(\mathbf{r}-\mathbf{a})\,.\,(\mathbf{r}-\mathbf{b})=0\]

If r be position vector of any point on a sphere and a, b are respecti

1.	If r be position vector of any point on a sphere and a, b are respectively position vectors of the extremities of a diameter, then [MP PET 1994]
A.	\[\mathbf{r}\,.\,(\mathbf{a}-\mathbf{b})=0\]
B.	\[\mathbf{r}\,.\,(\mathbf{r}-\mathbf{a})=0\]
C.	\[(\mathbf{r}+\mathbf{a})\,.\,(\mathbf{r}+\mathbf{b})=0\]
D.	\[(\mathbf{r}-\mathbf{a})\,.\,(\mathbf{r}-\mathbf{b})=0\]
Answer» E.

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If r be position vector of any point on a sphere and a, b are respectively position vectors of the extremities of a diameter, then [MP PET 1994]

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