Chapter 26, Problem 24P

GO Figure 26-25a gives the magnitude E(x) of the electric fields that have been set up by a battery along a resistive rod of length 9.00 mm (Fig. 26-256).The vertical scale is set by E_s = 4.00 × 10³ V/m. The rod consists of three sections of the same material but with different radii. (The schematic diagram of Fig. 26-25b does not indicate the different radii.) The radius of section 3 is 2.00 mm. What is the radius of (a) section 1 and (b) section 2?

Figure 26-25 Problem 24.