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because i am quite confused by E and V

why is it that the electric field E is = 0 IN a conducting charged sphere of radius R, AND V = k (q/R) ,

WHEREAS, the electric field E is = 0 IN a long positively charged cylinder with uniform charge per unit length along its axis , AND V = 0 here.

so why is there a value for V in a conducting charged sphere and not in a long positively charged cylinder with uniform charge per unit length?

so is there anything special that one should look out for to determine whether is the potential V inside anything 0 or something? how do we know?

thanks a lot!