Question

What does the direction of thumb indicate in the "right-hand thumb rule"?

• A. Velocity
• B. Magnetic field
• C. Force
• D. Current

Answer 1

The correct option is D Current

Right hand thumb rule:
When an electric current passes through a straight wire that is held by the right hand with the thumb pointing upwards and the fingers curling up the wire, the thumb points in the direction of the conventional current (from positive to negative), and the fingers point in the direction of the magnetic field.