Figure 26-29a 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. 26-296). The vertical scale is set by `E_(s)=8.00 xx 10^3 V//m`. The rod consists of three sections of the same material but with different radii. (The schematic diagram of Fig. 26.29b does not indicate the differencet radii). The radius of section 3 is 1.70 mm. What is the radius of (a) section 1 and (b) section 2?

Answer

(a) 1.32 mm; (b) 104 mm