The coaxial cable shown in FIGURE P29.56 consists of a solid inner conductor of radius R1 surrounded by a hollow, very thin outer conductor of radius R2. The two carry equal currents I, but in opposite directions. The current density is uniformly distributed over each conductor. a. Find expressions for three magnetic fields: within the inner conductor, in the space between the conductors, and outside the outer conductor. b. Draw a graph of B versus r from r = 0 to r = 2R2 if R1 = 1 3 R2.

Physics 211 Week 1: Units and Significant Figures Fundamental Units and Derived Units Fundamental Units: Units of measurement that are independent of other types of measurement. They are set by a standard and are the basis for creating derived units. There are 4 fundamental units of interest in this course: Length (meters), Mass (grams), Time (seconds), and Current (ampere) Derived Units: Units of measurement that are composites of fundamental units, or are in some way related to the fundamental units. Example being speed, which is distance (length) over time. There are many different derived units. Fundamental Units: SI (metric system) Notation English Units Length Meters (m) [L] Feet