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 ______.

A. A circuit
b. A conductor
c. A fuse
d. An insulator

Answer :

rubber is an insulator
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When there are two pieces of wire that allow electrons to pass through them when they are connected to each other. When there is a piece of rubber that is between the two wires, the electrons won't flow. The rubber material is considered an insulator. 

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