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.
Many of their quills are fringed with white, which makes them stand out against the dark fur underneath. This white on black marking pattern warns even color-blind predators that porcupines are dangerous. Quills are usually 75 mm long and 2 mm wide.