2015+1-1,2,3+all.pdf

# Iii if the rubbing machine charged the gentlemans

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iii) If the rubbing machine charged the gentleman’s body, the spark would occur. iv) However, if the gentleman’s body was not charged either (for example, the rubbing machine failed) there would be no sparks, because both bodies would be at or around the ground potential (zero voltage). Conclusion: Statement #2 may be false, but we do not have enough information. Book Page 142

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EE for 21 st century 1-3 Prevent electrostatic discharge 1-3-1 Hazards of ESD for EE © 2015 Alexander Ganago Page 20 of 23 Last printed 2015-07-24 6:00 PM File: 2015 1-3-1 ESD.docx Statement #3: If both the lady and the gentleman were wearing dissipative wristbands connected to each other via a 1- M Ω resistor, there would be no spark between their bodies, but if a third person approached them, the spark could occur. Reasoning: i) If the two experimentalists connected their bodies as described here, their electric potentials would definitely get equal to each other, eliminating any spark between the two bodies. ii) The body of a third person could be charged to a different potential (up to 35 kV due to walking across carpet) thus a spark could occur between the third person and any of the two experimentalists. Conclusion: Statement #3 is correct. T YPICAL PROBLEMS FOR S ELF -A SSESSMENT , BASED ON E XAMPLE 1 Continue the analysis of the old French experiment (Figure 7) and determine whether the following statements are true, false, or some important information is lacking. Statement #4: If the gentleman were wearing a dissipative wristband connected to the ground via a 1-M Ω resistor, there would be no spark whatsoever, regardless of what the lady was doing. Statement #5: The sparks would be larger if they repeated the experiment outdoors under a heavy rain. Statement #6: To avoid or reduce sparks between their bodies, you would use an air ionizer. Statement #7: It is important that the gentleman has his body suspended: if he were standing on the same carpet with the lady, there would be no sparks whatsoever. Answers to these problems are at the end of the Unit. Book Page 143
EE for 21 st century 1-3 Prevent electrostatic discharge 1-3-1 Hazards of ESD for EE © 2015 Alexander Ganago Page 21 of 23 Last printed 2015-07-24 6:00 PM File: 2015 1-3-1 ESD.docx O THER PROBLEMS FOR S ELF -A SSESSMENT 1 Consider the following statements: 1. Grounding effectively removes static charges from all materials. 2. Grounding can bring electrons to a positively charged conductor. 3. Grounding is the least effective way of removing pre-existing static charges. 4. Grounding of the human body is useless. The true statements are: A. Only 1 B. Only 2 C. 3 and 4 D. All on the list E. None on the list. Solution to this problem is at the end of the Unit. 2 Consider the following statements: Triboelectric effect … 1. Cannot charge the human body. 2. Is the least common way of charging any material.

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• Fall '07
• Ganago
• Electric charge, Alexander Ganago

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