CH15-HW03-FALL2010 - 1 2/14/11 CH15-HW03-FALL2010 WebAssign

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12/14/11 CH15-HW03-FALL2010 1/6 www.webassign.net/web/Student/Assignment-Responses/last?dep=3173265 Current Score : 17 / 17 Due : Sunday, September 11 2011 11:59 PM EDT 1. 2/2 points | Previous Answers MI3 15.7.X.077.alt01 You run your finger along the slick side of a positively charged tape, and then observe that the tape is no longer attracted to your hand. Which of the following are plausible explanation(s) for this observation? Check all that apply. Solution or Explanation Negatively charged particles must move onto the tape to give it a net charge of zero. Your hand does not have a mobile electron sea (you are not made of metal). It would require a huge amount of energy to pull a proton out of an atomic nucleus. Read the eBook Section 15.7 2. 2/2 points | Previous Answers MI3 15.7.X.078 You observe that a negatively charged plastic pen repels a charged piece of magic tape. You then observe that the same piece of tape is repelled when brought near a metal sphere. You are wearing rubber soled shoes, and you touch the metal sphere with your hand. After you touch the metal sphere, you observe that the tape is attracted to the metal sphere. Which of the following statements could be true? Check all that apply. CH15-HW03-FALL2010 (Homework) Rachel Pereira PHYS 272-Fall 2011, Fall 2011 Instructor: Virendra Saxena Web Assign The due date for this assignment is past. Your work can be viewed below, but no changes can be made. Sodium ions (Na + ) from the salt water on your skin move onto the tape, leaving the tape with a zero (or very small) net charge. Electrons from the mobile electron sea in your hand move onto the tape, leaving the tape with a zero (or very small) net charge. Chloride ions (Cl - ) from the salt water on your skin move onto the tape, leaving the tape with a zero (or very small) net charge. Protons are pulled out of the nuclei of atoms in the tape, and move onto your finger.
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12/14/11 CH15-HW03-FALL2010 2/6 www.webassign.net/web/Student/Assignment-Responses/last?dep=3173265 Solution or Explanation You're wearing insulating shoes, so charged particles can't travel through you to the Earth. The tape is negatively charged, so it will repel chloride ions. There aren't any mobile electrons in/on
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This note was uploaded on 12/14/2011 for the course PHYS 272 taught by Professor K during the Fall '07 term at Purdue University-West Lafayette.

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CH15-HW03-FALL2010 - 1 2/14/11 CH15-HW03-FALL2010 WebAssign

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