Question
If $\vec{A} = 2\hat{i} + 3\hat{j} + 8\hat{k}$ is perpendicular to $\vec{B} = 4\hat{i} + 4\hat{j} + a\hat{k}$, then the value of $a$ is.
If $\vec{A} = 2\hat{i} + 3\hat{j} + 8\hat{k}$ is perpendicular to $\vec{B} = 4\hat{i} + 4\hat{j} + a\hat{k}$, then the value of $a$ is.