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A composite rod made up of two conductors of resistivity ρ1 and ρ2 is show in the figure. If face A and B are connected to a battery, find the resistance of the rod.


Option 1 -

(ρ₁+ ρ₂)L / 4a²

Option 2 -

(3ρ₁+ ρ₂)L / 3a²

Option 3 -

ρ₁ρ₂L / a²(3ρ₁+ρ₂)

Option 4 -

3ρ₁ρ₂L / a²(3ρ₁+ρ₂)

0 2 Views | Posted 4 weeks ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    4 weeks ago
    Correct Option - 3


    Detailed Solution:

    R? = (ρ? L)/a² R? = (ρ? L)/ (3a²)
    Both are in parallel . R? = (R? )/ (R? +R? ) = (ρ? ρ? L)/ (a² (3ρ? +ρ? )

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