Jun Jie tested four materials by placing them in the gap of a circuit. Which material will allow the bulb to light up?
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Worked Solution
Step 1: For the bulb to light, the material must be an electrical conductor.
Step 2: Most non-metals are insulators, but graphite is a conductor.
Step 3: Graphite will complete the circuit.
Correct answer: Graphite pencil lead
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