cannot be used as a material for a lightning rod.

Iron

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Copper

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Aluminium

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Wood

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Solution

The correct option is D Wood
A lightning rod or a lightning conductor, needs to be an excellent conductor to allow the flow of electrons to the ground. Wood is a poor conductor of electricity, and thus cannot serve the purpose. Iron, copper and aluminium, being metals, are good conductors of electricity, and hence, can be used as a building material for a lightning rod.

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