Question
If two vectors $\overrightarrow P = \widehat i + 2m\widehat j + m\widehat k$ and $\overrightarrow Q = 4\widehat i - 2\widehat j + m\widehat k$ are perpendicular to each other. Then, the value of m will be :
If two vectors $\overrightarrow P = \widehat i + 2m\widehat j + m\widehat k$ and $\overrightarrow Q = 4\widehat i - 2\widehat j + m\widehat k$ are perpendicular to each other. Then, the value of m will be :