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(II) A thin cylindrical shell of radius R1 = 6.5 cm is surrounded by a second cylindrical shell of radius R2 = 9.0 cm, as in Fig. 22–35. Both cylinders are 5.0 m long and the inner one carries a total charge Q1 = −0.88 μC and the outer one Q2 = +1.56 μC. For points far from the ends of the cylinders, determine the electric field at a radial distance r from the central axis of (a) 3.0 cm, (b) 7.0 cm, and (c) 12.0 cm.
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