Luke tested four objects (P, Q, R, S) by placing them in the gap of an electrical circuit. Only objects P and R caused the bulb to light up. What could objects Q and S be?
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Worked Solution
Step 1: The bulb did NOT light up for Q and S.
Step 2: This means Q and S must be electrical insulators.
Step 3: Glass and rubber are both insulators.
Correct answer: Q: Glass rod; S: Rubber eraser
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