Design+Challenge

=My styrofoam cup/plate speaker=

Material:

 * ======2 small magnets======
 * ======2 feet copper wire======
 * ======tape/ glue======
 * ======1 styrofoam plate======
 * ======a sheet of paper======
 * ======1 plug with alligator clips for connecting to the itunes======

=
1) Roll a piece of paper around the magnets, and then curl the wire which is about a meter long around the paper and magnet. Use tape to hold the wire and the paper as well as leaving the beginning and end part of the wire out.======



=
I used a copper wire, because according to the **Faraday's law**, a copper loop easily produces **current**. My laptop sends a voltage inside the wire of the **circuit** to the speaker. When the current moves forwards and backwards, changes occur to my speaker. Firstly, the copper wire, which is wrapper around a paper, changes my magnet to an **electromagnet**. Secondly, the South Pole and the North Pole of the wire rotates. The magnet is connected to the styrofoam, a signal is passed through the wire, which generates a **magnetic field** and is **attracted** and **repelled** by the magnets. As a result, the magnet vibrates as it attracts and repels the wire. The vibrations changes into **sound energy** and my speaker starts to play music.======