Q. 104.4( 18 Votes )

A cylindrical conductor of length l and uniform area of cross section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section
A. A/2

B. 3A/2

C. 2A

D. 3A

Answer :

Case 1: when length is l and Area of cross section is A


Resistivity will be


Case 2: when length is 2l and resistance is R and let area is A’


Resistivity will be


As given in the question both conductors are of same material and has same area of cross-section, therefore, resistivity will be equal



And therefore, A’= 2A

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