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Yesterday I was leaving a shop, I had an ethernet cable in my backpack, and it reacted with the anti-theft gate, causing a false alarm. I was just wondering why.. I had also other cables (hdmi, power cord) but after some trials we found out that was the ethernet one. Thank you

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The cable happened to have correct length, inductance and capacitance so it acted as an antenna identical to the anti theft tag. The gate cannot know the difference between them.

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