Teaching UP TGT Mock Test Series 2025 Physics Current, Resistance and Electricity Combination of Resistors — Series and Parallel
Two identical wires of different materials are connected in series. If their resistivity is ρ1 and ρ2 respectively, the equivalent resistivity of the combination is-
1
ρ12 + ρ22
2
ρ1 + ρ2
3
\(\sqrt{ρ_1ρ_2}\)
4
ρ1ρ2