Steps 10, 11: The white charge producer is inserted into the pail again but this time we let it touch with the inside of the Faraday pail. Then we remove it out and note the reading on the electrometer. Question: Why is there a positive voltage reading on the electrometer even though the white charge producer is removed? 23V

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Ferromagnetism

Ferromagnetism is a mechanism by which some materials show magnetic properties. Iron and magnetite, an oxide of iron, are two naturally occurring materials that show the property of ferromagnetism. The word ferromagnetism is derived from the Latin name of iron, "Ferrum" as it was the first observed material to show such property. The property of ferromagnetism is shown by only a few substances such as iron, nickel, cobalt, and their alloys. Some transition metals and alloys of rare-earth metals also show ferromagnetism.