Two wires of equal length and equal diameter and having resistivities ρ₁ and ρ₂
Two wires of equal length and equal diameter and having resistivities ρ₁ and ρ₂ are connected in series. The equivalent resistivity of the combination is
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(a) ρ₁+ρ₂/2 (b) ρ₁+ρ₂ (c) ρ₁ρ₂/ρ₁+ρ₂ (d) √ρ₁ρ₂