<span>The distance between two objects is increased by three times the oringinal distance. Since they were already separated by one time the original distance, the additional three times the oringinal distance now puts them four times the original distance apart.
Whether we're talking about the gravitational forces of attraction or the electrical forces of attraction, either one is inversely proportional to the square of the distance between the objects.
So changing the distance to four times the original distance causes the forces to become 1/4</span>² as strong as they were originally.
The forces become 1/16 of their original magnitude.<span> </span>
To make something electrical you need electricity and the wires will turn a magnet into an electromagnet. or for a short answer: <span>1) soft iron core 2) coil of insulated wire 3)source of electricity</span>
