Distribution of charge wrt static electricity

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Discussion Overview

The discussion revolves around the distribution of static electricity charge on the human body, particularly in the context of wearing rubber-soled shoes and walking on a rug. Participants explore the mechanisms of charge transfer, including induction and direct migration, and the implications for experiencing electric shocks.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions whether charge migrates from the shoes to the body or if the charge creates an electric field that induces a negative charge in other parts of the body.
  • Another participant suggests that both charge migration and induction may occur, noting the high voltage but low current associated with static electricity.
  • A different participant states that charge moves from high potential to low potential, but the high resistance results in a slow rate of movement.
  • Some participants argue that if the shoe sole is perfectly insulating, it could only charge the body by induction, but question whether enough charge could accumulate to feel a spark.
  • There is a consensus among some that shoes have some conductivity, but not enough to be considered perfect insulators.

Areas of Agreement / Disagreement

Participants express differing views on the mechanisms of charge distribution and the role of shoe conductivity. There is no clear consensus on whether charge migration or induction is the primary process, and the discussion remains unresolved.

Contextual Notes

Participants acknowledge the complexity of static electricity, including the effects of high voltage and low current, but do not resolve the assumptions regarding the conductivity of shoe soles or the specifics of charge distribution.

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How is static electricity charge distributed over the human body if skin (1100 - 496,000 ohms) is a good insulator? For example, if one wears rubber-soled shoes and walks around on a rug, the shoes will obtain a negative charge. Then, if one touches a doorknob or some other metal object, a spark can result. My question is if charge is migrating from the shoes and being distributed throughout the body, or is the charge on the shoes creating an electric field that is inducing a negative charge in other parts of the body, such as the hands, which discharges to a grounded object? Is there a current or simply an induced charge?
 
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Hrmm. I think its a little bit of both effects, but I'm not sure. Remember that static electricity has a very high voltage, but very little current. I have had training on Electrostatic Discharge protection for electronic components, and it is possible for static electricity to damage an electronic component when you touch it, but not have enough current/voltage for you to even feel a shock. This is one way latent failurs happen in electronics. I'd say this is enough voltage to travel through your body, but little enough current to cause any harm.
 
Charge moves spontaneously from high potential to low potential. If the resistance is high, the rate is very slow.
 
If the sole of the shoe is perfectly insulating, it could charge the body only by induction. However the sole is very small compared to the body so you wouldn't get enough charge that way to feel a spark.
If you rub your shoes on a rug and get a spark the soles must be at least slightly conductive.
 
DrZoidberg said:
If the sole of the shoe is perfectly insulating, it could charge the body only by induction. However the sole is very small compared to the body so you wouldn't get enough charge that way to feel a spark.
If you rub your shoes on a rug and get a spark the soles must be at least slightly conductive.

Yes, shoes do have some conductivity. Just not a lot. I don't believe there is a perfect insulator.
 

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