Wrapping the copper wire around an iron nail, increasing the current.   Increase the power going through the wire or have more wire wrapped around the metal object. So in â¦ the case of a nail with wire wrapped around it, the more wraps you do the stronger the electromagnet will be.
Porcupines are a type of rodent found in two main regions of the world, so scientists group them into either Old World or New World porcupines.
The porcupines found in North and South America are good climbers and spend much of their time in trees. Some even have prehensile (gripping) tails to aid in climbing. The North American porcupine is the only species that lives in the U.S. and Canada, and is the largest of all porcupines.A single animal may have 30,000 or more quills. North American porcupines use their large front teeth to satisfy a healthy appetite for wood.here are about two dozen porcupine species, and all boast a coat of needle-like quills to give predators a sharp reminder that this animal is no easy meal. Some quills, like those of Africa's crested porcupine, are nearly a foot (30 centimeters) long.