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) \[(\mathbf{r}-\mathbf{a})\,.\,(\mathbf{r}-\mathbf{b})=0\]
Correct Answer: D
Solution :
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