Question
3. A long coaxial cable is made of an inner solid cylindrical rod of radius a and an outer cylindrical thin shell of radius b. The inner rod carries a uniform volume positive charge density p. The outer shell carries negative charge with a uniform surface charge density p, which is of just the right amount to make the cable as a whole electrically neutral. Find the electric field E in the regions: a) inside the inner cylinder (r< a), b) between the cylinders (a b).
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