The pattern of the magnetic field is primarily influenced by the current flow and not the shape of the conductor. For a straight conductor, the magnetic field forms concentric circles. However, the strength of the magnetic field may vary based ...

The pattern of the magnetic field around a straight conductor is determined by the right-hand rule. The magnetic field forms concentric circles around the conductor, and the direction of these circles depends on the direction of the current flow.

The deflection of the compass needle decreases as the distance from the current-carrying wire increases, indicating a diminishing magnetic field influence with greater distance.

The magnetic field produced by a current-carrying straight wire decreases as the distance from the wire increases, as illustrated by the concentric circles becoming larger in the figure.

When the compass is moved away from the copper wire while maintaining the same current, the deflection in the needle decreases.