ocr: For this experiment you will need a very long thin copper wire (be sure to remove the insulating varnish with sandpaper) and a wooden pencil. Wrap the wire tightly around the pencil as many times as you can. Carefully, connect this bobbin you just built - - - A à - to Tatch a the battery changes just in like the you see brightness in the of the picture. small a lamp as you modify the point at which the wire connected to the base touches the bobbin. The explanation is simple: the longer the wire where the electricity flows, the more the - energy used up in overcoming its resistance and the less ...
