Question

what is right hand rule ???

Answer 1

The right hand rule is used to determine the direction of the magnetic force on a positive charge.The right hand rule states that, to find the direction of the magnetic force on a positive moving charge, the thumb of the right hand point in the direction of v, the fingers in the direction of B, and the force (F) is directed perpendicular to the right hand palm.

Answer 2

Right Hand Rule
If we hold the current carrying conductor in right hand such that the thumb points in the direction of flow of current, then the fingers encircle the wire in the direction of the magnetic field lines.