An infinitely long object consists of an inner cylinder of radius a which has a uniform positivevolume charge density p > 0 and a concentric thin cylinder of radius b which has a uniformnegative surface charge density o<0 is shown in figure 7. The total charges on the cylindersare equal but opposite.a) Calculate the electric field for r 0Figure 7: A cross-sectional view of two cylindersc) Calculate the electric field for r > b.b0 <0d) Calculate the electric potential difference for r

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