An electric guitar produces static noise when plugged into an outlet WITHOUT a ground connection because the lack of a proper ground path allows electrical interfere...
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An electric guitar produces static noise when plugged into an outlet WITHOUT a ground connection because the lack of a proper ground path allows electrical interference from the environment to be picked up by the guitar's sensitive circuitry, causing unwanted noise to be amplified through your amp; essentially, the guitar has no way to properly dissipate electrical noise without a ground wire.