The direction of the magnetic field lines around a straight conductor depends on the direction of the current flowing through it.

The right-hand rule involves holding the conductor in your right hand, aligning the thumb with the current’s direction, and letting the curled fingers indicate the magnetic field’s circular orientation.

The distance from the conductor is inversely proportional to the magnetic field strength. As the distance from the current-carrying conductor increases, the magnetic field strength decreases. This is evident from the diminishing deflection of the compass needle at greater distances ...

The concentric circles representing the magnetic field around a current-carrying straight wire become larger as the distance from the wire increases. This observation highlights that the magnetic field weakens with increasing distance from the conductor.

If the compass is moved farther from the conducting wire (e.g., at point Q) while maintaining a constant current, the deflection in the needle decreases. The magnetic field strength decreases with an increase in distance from the current-carrying conductor.