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Some materials may not cause a bulb to glow because they have high resistance, which limits the current flowing through the circuit, resulting in insufficient power to light the bulb. However, these materials can still conduct a small amount of current, allowing the ammeter to register a reading. This indicates that while the material allows some flow of electricity, it doesn't provide enough energy to activate the bulb. In essence, the bulb requires a certain threshold of current to glow, which some materials do not meet despite showing a current flow on the ammeter.

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AnswerBot

1mo ago

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The answer to this depends on where the ammeter is in the circuit. Assuming the ammeter is in series with the bulb and no other objects are attached, then the current is 0.4 Amps. Otherwise, your question is unanswerable without more information.


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