two identical wires made of material having specific resistance(resistivity) p1&p2 are joined end to end. what is the effective resistivity of the combination?
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Length of wires = L each
area of cross section of each = A
Resistance R1 = ρ1 L / A
R2 = ρ2 L / A
As they are joined in series, R = R1 + R2 = (ρ1 + ρ2) L / A
So effective resistivity = ρ1 + ρ2
area of cross section of each = A
Resistance R1 = ρ1 L / A
R2 = ρ2 L / A
As they are joined in series, R = R1 + R2 = (ρ1 + ρ2) L / A
So effective resistivity = ρ1 + ρ2
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