Which of the following materials would allow a bulb to light up when placed in a gap in a circuit?
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Worked Solution
Step 1: To light the bulb, the material must be an electrical conductor.
Step 2: Most non-metals are insulators, but graphite is a form of carbon that conducts electricity.
Step 3: Graphite is commonly found in pencil leads.
Correct answer: A graphite pencil lead
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