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# ConstantsIn this example will use the quantization of charge to delermine Ihe number excess electrons in an object: (a) A large lastic block has charge of 1.0 pC .0...

## Question

###### ConstantsIn this example will use the quantization of charge to delermine Ihe number excess electrons in an object: (a) A large lastic block has charge of 1.0 pC .0 X10 How Asay moro electrons than protons aro in tho block? (b) When rubbed with silk cloth; glass acquires_ nel posilive charge ol 1.0 nC . Il the rod contains 0 mole of molecules; what fraction of the moleculos have been stripped of an electron? Assume that at most one electron emoved from any molecule:SOLUTIONSET UP AND SOLVE Part

Constants In this example will use the quantization of charge to delermine Ihe number excess electrons in an object: (a) A large lastic block has charge of 1.0 pC .0 X10 How Asay moro electrons than protons aro in tho block? (b) When rubbed with silk cloth; glass acquires_ nel posilive charge ol 1.0 nC . Il the rod contains 0 mole of molecules; what fraction of the moleculos have been stripped of an electron? Assume that at most one electron emoved from any molecule: SOLUTION SET UP AND SOLVE Part (a): We want t0 find tne number of electrons N needed for net charge object: Each electron has charge We divide Ihe tolal charge by ~LUxlO 6.2 x 1012 clcctrons CluUX 1.0 x 10-6 C on Part (b): First we (ind the number Nion of positive ions needed Iotal charge of 1.0 nC each ion has charge +e_ The number of molecules in mole Avogadro's number; 6.02 102 50 the rod contains 6.02 1033 molecules_ part (a) , we divide the total charge 5 on the rod by the charge of one ion: Remember that #C C. Thus, Nion L0XIQ 1.6*10 6.25 109 The fraction all thc molecules that arc ionized 6.25x 10" 6.02*102 1.0 * 10-14 6.02x108 REFLECT charge imbalance about 10-1 is typical for charged objects. Common objects contain huge amount of charge, but they have very neary aqual amounts positive and negative charges. Part A - Practice Problem: A tiny object contains 25*1012 protons and 80x1012 electrons; What is the net charge on the object? Express the net charge In Coulombs two slgnificant flgures. AZd 232 Submit Previous Answers Request Answer Incorrect; Try Again; attempts remaining

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