Question

right hand thumb rule​

Answer 1

it states that when we strecth our thumb middle finger and fore finger mutually perpendicular then thumb shows the direction of force middle finger shows magnetic field and fore finger shows current direction

thumb=Father=force

forefinger =Mother=Magnetic field

middle finger=Child=current

Answer 2

The direction in vector cross product is determined by the right hand screw rule and the right hand thumb rule.

Right hand thumb rule - Here the fingers of the right hand are curled from Vector A to B. Then the direction of erect thumb will give the direction of C.