A long solid non-conducting cylinder of radius R is charged such . . .

Question : A long solid non-conducting cylinder of radius R is charged such that the volume charge density is proportional to r where r is the distance from axis. The electric field E at a distance r (r<R) will depend on r as 

a) E∝r

b) E∝r²

c) E∝(1/r)

d) E∝(1/r²)

Doubt by Aanshika

Ans : b) is the correct option.

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