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Two wires of the same dimensions but resistivities ρ1 and ρ2 are connected in series. The equivalent resistivity of the combination is

(1) ρ1 + ρ2

(2) $\frac{{\rho }_{1}+{\rho }_{2}}{2}$

(3) $\sqrt{{\rho }_{1}{\rho }_{2}}$

(4) $2\left({\rho }_{1}+{\rho }_{2}\right)$