Two wires of same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is
A. ρ1 + ρ2
B. ρ1 + ρ2 / ρ1ρ2
C. ρ1ρ2 / ρ1 + ρ2
D. |ρ1 + ρ2|
Answer:C
Two wires of same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is
A. ρ1 + ρ2 B. ρ1 + ρ2 / ρ1ρ2 C. ρ1ρ2 / ρ1 + ρ2 D. |ρ1 + ρ2|