Discussion
In a geyser the material filled between the outer casing and the inner tank should have the following property:
Answer: D
A geyser is a water heater, and its purpose is to keep the heat in the water. The space between the outer casing and the inner tank is therefore filled with a heat insulating material, such as glass wool, so that little heat is lost to the surroundings and the water stays hot. A material of high heat conduction would carry the heat away, and high electric conductivity and high magnetic permeability have no use in the filling. The answer is heat insulation, option (D).
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