How do you get the screwdriver to restore the magnetic force?
Using one of the poles of the permanent magnet, the screwdriver slides from top to bottom and ends, and then repeats the process from the upper contact to the downward direction,
Force (magnetic) is the force of the magnetic field in which the magnets and currents are placed. Magnetic force is the electromagnetic field, the speed of the electromagnetic field is the speed of light, and the speed of the action of the magnetic force is also the speed of light. As it is not yet clear about its nature, it is not known whether a magnetic black hole exists, and no strong magnetic field has been observed at present. And if the magnetic force does not bend spacetime, it does not form a magnetic black hole.
Using one of the poles of the permanent magnet, the screwdriver slides from top to bottom and ends, and then repeats the process from the upper contact to the downward direction.
