The magnetic force allows to find the result for the question about the characteristics of the material is:
Ampere's law explains the formation of the magnetic field due to the movement of the charges in the solenoid wire.
For the switch to move it must be a metal that is attracted by the magnetic field, to increase the force to the maximum possible it must be a metal that has many electrons with unpaired spin and these can feel the force of the magnetic field.
One of the most used metals is iron, which has 5 unpaired electrons and is the one that most feels the forces of the magnetic field.
In conclusion using the magnetic force we can find the result for the question is:
Learn more about magnetic force here: brainly.in/question/335180