Answer :

**Parameters of cylinder A:** Length = l, Area of cross-section = A, Resistance = R and resistivity = ρ

**Parameters of cylinder B:** Length = 2l, Area of cross-section = A’ (To be calculated); Resistance = R and resistivity = ρ

Resistance of cylinder A can be written as, (1)

Resistance of cylinder A can be written as, (2)

Dividing 1 and 2,

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