physics 1b ch 17 solutions

physics 1b ch 17 solutions - Chapter 17 Current and...

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

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 17 Current and Resistance Problem Solutions 17.1 The charge that moves past the cross section is ( ) Q I t = , 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-- = = = = The negatively charged electrons move in the direction opposite to the conventional current flow. 17.3 The current is Q V I t R = = . Thus, the change that passes is ( ) V Q t R = , giving ( ) ( ) ( ) 1.00 V 0.100 A 20.0 s 2.00 C 10.0 Q t = = = 69 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 = = = , 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...
View Full Document

Page1 / 5

physics 1b ch 17 solutions - Chapter 17 Current and...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online