Quiz11spring2004 - ENSC 3313, Spring 2004 Quiz 11-ANSWERS...

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ENSC 3313, Spring 2004 Quiz 11-ANSWERS Name ________________________________ Answer any 4 questions only , 1 point each 1. The resistivity of pure copper is ~1.7 × 10 -8 -m at room temperature and ~0.9 × 10 -8 -m at -100 o C. Explain. This is an illustration of the temperature dependence of electron mobility on temperature. At higher temperatures, more thermal vibrations cause more scattering events which in turn lower electron mobility and increase resistivity. Conversely, lower temperatures reduce thermal vibrations and raise electron mobility, hence reducing the resistivity. 2. I've designed a capacitor using aluminum oxide which has a dielectric constant of 3, the capacitance is too low. How much of an increase in dielectric constant would I need to increase the capacitance by 500%? The capacitance is given by: C=Q/V, or in geometry independent terms: ε r =D/E. Thus the relationship between the dielectric constant ε r and C is: C = ε r A/d, where A is the capacitor area and d is the
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This note was uploaded on 01/10/2012 for the course ENSC 3313 taught by Professor Staff during the Fall '11 term at Oklahoma State.

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Quiz11spring2004 - ENSC 3313, Spring 2004 Quiz 11-ANSWERS...

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