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Mathematics 21 Online
OpenStudy (anonymous):

You have two pieces of wire that allow electrons to pass through them when they are connected to each other. If you insert a piece of rubber between the wires, the electrons do not flow. The rubber material is ________.

OpenStudy (anonymous):

It's an insulator because it's not a conductor. Next time though try posting your question in a more appropriate study... this clearly isn't math (:

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