According to the right-hand thumb rule, if the thumb points in the direction of current, then the fingers show:
direction of magnetic field lines
Correct Answer: Direction of magnetic field lines
Right-Hand Thumb Rule: If the right hand holds a current-carrying conductor with the thumb pointing in the direction of conventional current, then the curled fingers indicate the direction of the magnetic field lines (circular) around the conductor.
This rule helps determine the direction of the magnetic field created by a straight current-carrying conductor or a solenoid.
- For a solenoid: thumb = direction of current → fingers wrap around to show field direction inside.
- Alternative: Maxwell's corkscrew rule (turn corkscrew in direction of current → field direction is the rotation).
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