It may have something to do with magnetic forces at those points.

Would there be any change in the intensity of the magnetic force?

They each seemed drawn to the square by a magnetic force.

Thus they were pinned against the wall by the magnetic force.

She'd felt Eric's presence like a magnetic force on her gaze.

That quality possessed by some which draws all others with its magnetic force.

A primary objective is a study of the planet's strong magnetic forces.

The direction of the magnetic force is given by the right hand rule.

These two set of moving charges will feel magnetic force between each other.

I mean, lines of magnetic force have no physical reality, but they're there, aren't they?