Question

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​

Answer 1

We know that, R=ρL/a

Therefore resistances of wires are ρ1 L/a  and  ρ2 L/a

R=L/a(ρ1 + ρ2)

As, V=IR

V=I X  L/a(ρ1 + ρ2)

ρ=(R X a)/L

ρ=(L/a(ρ1 + ρ2) X a)/2L

ρ=(ρ1 + ρ2)/2 ohm

Answer 2

Answer:

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