They can use the temporary magnetic field it creates to pick p a metal clip.
<u>Explanation:</u>
When a copper wire is wound around an iron cylinder and current is passed through the wire, the wire wound cylinder acts like a magnet. It is known that a current carrying wire develops a magnetic field around it. This is the magnetic effect of electric current.
When the current carrying wire is wound around a cylinder it will become similar to a solenoid which is a device that continuously produces magnetic field on passing current through it.
The magnetic field will cease existing once the current supply is cut off and thus it is temporary.
Although the DNA packaging with histones proteins is mean to form nucleosomes (groups of 8 histones proteins), the higher structures why the genetic material is packaged with those molecules is to form chromosomes, as you said.