CH20-HW02-FALL2010

CH20-HW02-FALL2010 - 1 CH20-HW02-FALL2010 Rachel Pereira...

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12/14/11 CH20-HW02-FALL2010 1/6 www.webassign.net/web/Student/Assignment-Responses/last?dep=3173282 Current Score : 20 / 20 Due : Sunday, November 6 2011 11:59 PM EST 1. 2/2 points | Previous Answers MI3 20.1.X.049 (a) Suppose you charge a 1.5 F capacitor with two 1.5 volt batteries. How much charge was on each plate? 4.5 4.5 C (b) How many excess electrons were on the negative plate? 2.8e19 2.81e+19 electrons Read the eBook Section 20.1 2. 2/2 points | Previous Answers MI3 20.2.X.064 (a) In tin at room temperature, the mobility of mobile electrons is about 1.5 10 -3 (m/s)/(V/m), and there are about 3.7 10 28 mobile electrons per m 3 . Calculate the conductivity σ . In actual practice, it is usually easier to measure the conductivity σ and deduce the mobility u from this measurement. 8.88e6 8.88e+06 (b) What are the correct units for σ ? Read the eBook Section 20.2 3. 1/1 points | Previous Answers MI3 20.2.X.065 Consider a platinum wire ( σ = 1.0 10 7 Ω 1 · m 1 ) with a cross-sectional area of 1 mm 2 (similar to your connecting wires) and carrying 0.3 amperes of current, which is about what you get in a CH20-HW02-FALL2010 (Homework) Rachel Pereira PHYS 272-Fall 2011, Fall 2011 Instructor: Virendra Saxena

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CH20-HW02-FALL2010 - 1 CH20-HW02-FALL2010 Rachel Pereira...

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