Ch15-h2-solutions

Ch15-h2-solutions - pan(zp695 Ch15-h2 chiu(56565 This...

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pan (zp695) – Ch15-h2 – chiu – (56565) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 of 2) 10.0 points Apo s i t iv e lyc h a r g edsph e r ei sp l a c edn e a r an eu t r a lb l o c ko Fn i c k e l ,a ssh owninth e Following fgure. + + + + + + + + Neutral nickel block Charged sphere Which oF the diagrams below best repre- sents the equilibrium distribution oF charge on the neutral nickel block? C A D B - - - - - - - - + + + + + + + + + - + - + - + - Correct answer: B. Explanation: The mobile electrons are attracted by the positively charged sphere at the right. Here E block due to the charges on the block is to the right, which is to be canceled by the feld oF the positive sphere, E sphere ,pointingtothe leFt. Among the Four blocks illustrated, B has the best chance For the cancellation oF net feld inside oF the block, leading to E block + E sphere =0 , i.e. ,inequilibriumcondition. 002 (part 2 of 2) 10.0 points At location P inside the nickel block the elec- tric feld due to the charged sphere is ± E = ±- 625 , 0 , 0 ² N / C . At equilibrium, which oF the Following state- ments must be true? A. It is not possible to determine the electric feld at location P due only to charges surFace oF the nickel block. B. The electric feld at location P due only to charges on the surFace oF the nickel block is ± E = ± 0 , 0 , 0 ² N / C C. Because the net electric feld at location P is ± E = ± 0 , 0 , 0 ² N / C , the feld at P due only to charges on the surFace oF the polarized nickel block must be ± E = ± 625 , 0 , 0 ² N / C . Correct answer: C. Explanation: The frst statement is incorrect since once the charges are given, the feld contributed by that charge can always be uniquely de- termined. The second statement is incorrect also. We know that E block + E sphere . However, here, E block is not zero. By in- spection it should be pointing to the right. The third statement is the correct one. ±rom above it is given that E sphere = ±- 625 , 0 , 0 ² N / C . With E block + E sphere , we have E block = ± 625 , 0 , 0 ² N / C . 003 10.0 points You run your fnger along the slick side oF
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pan (zp695) – Ch15-h2 – chiu – (56565) 2 apo s i t ive lycha rgedtape ,andthenob se rve that the tape is no longer attracted to your hand. Which of the following are not plausible explanations for this observation? List all that apply, separated by commas. If none apply, type “none”. A. Sodium ions (Na + )f romthesa l twa te r on your skin move onto the tape, leaving the tape with a zero (or very small) net charge. B. Electrons from the mobile electron sea in your hand move onto the tape, leaving the tape with a zero (or very small) net charge. C. Chloride ions (Cl - )fromthesa ltwater on your skin move onto the tape, leaving the tape with a zero (or very small) net charge. D. Protons are pulled out of the nuclei of atoms in the tape and move onto your Fnger.
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Ch15-h2-solutions - pan(zp695 Ch15-h2 chiu(56565 This...

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