When the compasses are moved close to a wire with a current which will the compasses point

In this demonstration, there is a single compass and a piece of wire that is perpendicular to the plane that the compass sits on. The wire with current flowing through it can alter the direction the compass needle points.

It can alter the direction of the compass

Some type of thing that was invisible

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .