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The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb.

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The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow ? Give reason to your answer

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The bulb will glow in circuit (D). 

This is because copper is the best conductor of electricity as compared to aluminium. Silk is a non-conductor of electricity.

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