If the length of a conductor is doubled while keeping other factors constant, its resistance will:
Double
The resistance of a conductor is given by \(R=\rho\frac{L}{A}\), where L is its length and A its cross-sectional area.
With resistivity and area held constant, resistance is directly proportional to length.
Doubling the length therefore doubles the resistance: \(R'=\rho\frac{2L}{A}=2R\).
Hence, the answer is double.
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