State and explain right hand screw rule.

Explanation

It states that if a right handed screw placed with its axis perpendicular to the plane direction of `veca` to the direction of `vecb` through smaller angel, then the sense of the advancement of the tip of the screw gives the direction of `(vecaxxvecb)or(vecc)`

Screw is rotated in such a way that direction of its tip advancement is the direction of `vecc`.
If screw is rotated in anti-clockwise direction the direction of `vecc` is negative and if rotated clockwise direction then the direction of `vecc` will be positive.
Moreover the direction of `vecc` can be obtained by another way.
In figure (b) shows that if we curl the finger of right hand, keeping the thumb erect, in such a way that the fingers point in the direction of rotation from `veca` to `vecb` through angle `theta`, then the thumb points in the direction of `vecaxxvecb or vecc`.
It can be said by another way. Open the right hand palm and fingers be curl from `veca` to `vecb` then erect thumb indicates the direction of `vecc`