Chapter 7: Questions 13, 14. Problems 16, 19, 25. Challenge 1.
Q7.13
The resistance will be higher, since the cylinder is both longer and smaller cross section. Both these changes increase resistance.
Q7.14
The resistance increases because picking it up warms the wire. The resistance of metals goes up when the temperature rises.
P7.15
P7.16
P7.19
P7.25
C7.1
