Question

A laminar body is uniformly rotating about an axis fixed in an inertial frame of reference. Let $\overrightarrow{A}$ be vector along the axis of rotation and $\overrightarrow{B}$ be the unit vector along the resultant force on a particle P of the body away from the axis. The value of $\overrightarrow{A}.\overrightarrow{B}$ is:

Answer 1

$\overrightarrow{A}$ is along the axis of rotation.
$\overrightarrow{B}$ lies in the plane of body.
$\overrightarrow{A}$ and $\overrightarrow{B}$ are always perpendicular to each other
$\Rightarrow \overrightarrow{A}.\overrightarrow{B}=0$