75. The radius of the cylinder (0.020 m, the same as rB) is denoted R, and the field magnitude there (160 N/C) is denoted EB. The electric field beyond the surface of the sphere follows Eq. 23-12, which expresses inverse proportionality with r: GEERrrRB=≥for.(a) Thus, if r = rC= 0.050 m, we obtain GE==1600 0200 05064bgbg bg..N C. (b) Integrating the above expression (where the variable to be integrated,
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