The use of the determiner 'these' is interesting because Sheila, could be saying, without meaning to...
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a long rod of length 'l', radius 'a' (a<<l) having charge 'q' distributed on it uniformly is surrounded concentrically by cylindrical tube of radius 'b' having charge -2q distributed uniformly on it's surface. find electric field at radial distance from axis of rod. if
a. r<a
b. a<r<b
c. r>b
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