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Article states that: "so a snack bag would potentially melt if it was used to try to block a strong radio signal from inside" - but if remember correctly, unles
by ivanhoe 9y ago
Article states that: "so a snack bag would potentially melt if it was used to try to block a strong radio signal from inside" - but if remember correctly, unless grounded, Faraday's cage will not affect the inner source at all, right? Gauss's law is only about the sum of external sources being 0.
- tzs 9y agoI would think that if it blocks outside signals from getting in, it would have to also block inside signals from getting out, because Maxwell's equations work equally well regardless of what direction time moves. Imagine a charge inside a Faraday cage. You wiggle it around, causing electromagnetic waves. If those were not blocked, they would cause various charges outside the cage to wiggle around. Call this experiment #1. That should mean that if instead of wiggling the inside charge around, you had wiggled all the outside charges around in the same pattern that experiment #1 caused them to wiggle in, the result should be the inside charge wiggling the same way you wiggled it in experiment #2.