Right hand thumb rule states that

• A. If we hold the current carrying conductor in right hand such that the thumb points in the direction of the flow of current, then the fingers encircle the wire in the direction opposite of the magnetic field lines
• B. If we hold the current carrying conductor in right hand such that the thumb points in the direction of the flow of current, then the fingers encircle the wire in the direction of the magnetic field lines
• C. If we hold the current carrying conductor in right hand such that the thumb points the magnitude of current, then the fingers encircle the wire in the magnitude of the magnetic field lines
• D. If we hold the current carrying conductor in the right hand such that the thumb points in the direction of the magnetic field lines, then the fingers encircle the wire in the direction of the electric current

The right-hand thumb rule is a helpful way to understand the relationship between electric current and magnetic fields. According to this rule:

Correct Interpretation

If you hold a current-carrying conductor with your right hand, positioning your thumb in the direction of the current flow, your fingers will curl around the wire in the direction of the magnetic field lines. Therefore, the correct answer is:

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

Key Points to Remember

• The thumb represents the direction of current.
• The curled fingers indicate the direction of the magnetic field.

This rule is essential in physics, especially when studying electromagnetism, as it visually demonstrates how electricity and magnetism interact.