What is the effect of a magnetic field on a conductor when the north pole is at 90 degrees?

The effect of a magnetic field on a conductor is dictated by the orientation of the conductor relative to the magnetic field lines. When a conductor is oriented at 90 degrees to the magnetic field, it experiences the maximum magnetic force, as described by the Lorentz force law. This law states that the force exerted on a charged particle moving through a magnetic field is at its greatest when the particle's velocity is perpendicular to the magnetic field lines.

When the north pole of the magnetic field is at a right angle to the conductor, the magnetic field lines intersect the conductor perpendicularly. This orientation allows for the maximum interaction between the magnetic field and the free charges within the conductor, resulting in the maximum possible force acting on the conductor. Hence, the conductor experiences the strongest magnetic force under these conditions.

In this context, other options do not apply as they suggest lesser effects or alternative scenarios that do not align with the principles of electromagnetism.