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If I have a strong battery, and I have a cable 2 light years long that stretches 1 LY into space from the battery, bends, and travels 1 LY back to the lightbulb, and the battery and light bulb are 1 meter from each other, how long will it take for the lightbulb to turn on when the circuit is completed/turned on?

If I have a strong battery, and I have a cable 2 light years long that stretches 1 LY into space from the battery, bends, and travels 1 LY back to the lightbulb, and the battery and light bulb are 1 meter from each other, how long will it take for the lightbulb to turn on when the circuit is completed/turned on?

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I have never asked this question. I asked a question about light and mirrors, are you confusing that for this?