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 quills of New World porcupines are much smaller (about 4 inches or 10 centimeters long) but work just as well. The end of each quill has a small barb (like a fish hook) that snags the flesh, keeping the quill stuck in the enemy's skin.