(N/A) The Right-Hand Screw Law is a rule used to determine the direction of the vector product (cross product) of two vectors,$\vec{A}$ and $\vec{B}$.
$1$. Imagine a right-handed screw placed at the point of intersection of vectors $\vec{A}$ and $\vec{B}$,with its axis perpendicular to the plane containing both vectors.
$2$. Rotate the screw from the direction of the first vector $\vec{A}$ towards the second vector $\vec{B}$ through the smaller angle between them.
$3$. The direction in which the screw advances (moves forward) represents the direction of the resultant vector $\vec{C} = \vec{A} \times \vec{B}$.
$4$. If the screw moves forward,the direction is outward from the plane; if it moves backward,the direction is into the plane.