Physics
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.
Electro-Magnetism
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Answer
The bulb will glow in circuit A as both the wires i.e. copper and aluminium are good conductors of electricity. But in other circuits B, C and D silk, cotton etc. are used which are insulators i.e. they do not allow the flow of electricity through them. So bulbs do not glow in circuits B, C and D.
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