Who has stated the Right-hand Thumb Rule?

The correct answer is: Maxwell

• Maxwell developed the right-hand thumb rule, which establishes the relationship between the magnetic field and the direction of current in a current-carrying conductor.
• The right-hand thumb rule says that if you picture holding a current-carrying conductor in your right hand with your thumb pointing in the direction of the current, the direction of your wrapped fingers around the wire will indicate the direction of magnetic field lines.