Discussion
Which of the following allow the electric current to pass through it ?
Answer: B
The material that conducts electricity is graphite.
In graphite each carbon atom bonds to only three others, leaving one electron free to move between the layers. These delocalised electrons carry an electric current, which is why graphite is used for electrodes and brushes in motors.
Glass, rubber and PVC have no free charge carriers and are electrical insulators, used to cover wires and handle electrical equipment safely.
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