{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

chp17solutions

# chp17solutions - Current and Resistance Problem Solutions...

This preview shows pages 1–3. Sign up to view the full content.

Chapter 17 Current and Resistance Problem Solutions 17.1 The charge that moves past the cross section is ( ) Q I t Δ = Δ , and the number of electrons is ( ) ( ) ( ) ( ) 3 20 19 80.0 10 C s 10.0 min 60.0 s min 3.00 10 electrons 1.60 10 C I t Q n e e - - Δ Δ = = × = = × × The negatively charged electrons move in the direction opposite to the conventional current flow. 17.3 The current is Q V I t R Δ Δ = = Δ . Thus, the change that passes is ( ) V Q t R Δ Δ = Δ , giving ( ) ( ) ( ) 1.00 V 0.100 A 20.0 s 2.00 C 10.0 Q t Δ = Δ = = Ω 69

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
70 CHAPTER 17 17.8 Assuming that, on average, each aluminum atom contributes one electron, the density of charge carriers is the same as the number of atoms per cubic meter. This is A A density N n mass per atom M N M ρ ρ = = = , or ( ) ( ) ( ) 23 3 6 3 3 28 3 6.02 10 mol 2.7 g cm 10 cm 1 m 6.0 10 m 26.98 g mol n × = = × The drift speed of the electrons in the wire is then ( ) ( ) ( ) 4 28 3 19 6 2 5.0 C s 1.3 10 m s 6.0 10 m 1.60 10 C 4.0 10 m d I v n e A - - - = = = × × × × 17.9 (a)
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern