A thin sheet of mica is placed on a horizontal copper plate, and a heated metal cone is laid on top of that. The cone begins to roll round its own apex on the mica. Why? What would happen if there were not a copper plate, but a sheet of glass under the mica?
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Sol. The mica is deformed by the heated metal cone on top of it and a bulge is formed as a result of the heating which is what makes the cone roll. The copper sheet under the mica cools the heated place quickly; thus the cone is in contact with cool mica at every moment and as this cool place is heated it too is deformed. If a sheet of glass lay under the mica, there would be no such cooling of the mica, which would soon grow hot and the cone’s movement across it would stop.
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