Ravi tested several materials by placing them in a gap in a circuit. The bulb lit up when he used a steel paper clip but NOT when he used a plastic ruler. This shows that __________.
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Worked Solution
Step 1: A bulb only lights up when the circuit is closed.
Step 2: A closed circuit requires a conductor to allow current flow.
Step 3: Since the clip lit the bulb, steel is a conductor.
Correct answer: steel is a conductor of electricity
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