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A Copper (Cu) rod of length 25cm and cross – sectional area 3 mm2 is joined with a similar aluminium (Al) rod as shown in figure. Find the resistance of the combination between the ends A and B.

(Take Resistivity of Copper = 1.7 × 10-8   Ω m

Resistivity of Aluminium = 2.6 × 10-8 Ω m )

Option 1 -

0.858  m Ω

Option 2 -

0.0858 m Ω

Option 3 -

1.420 m Ω

Option 4 -

2.170   m Ω

0 3 Views | Posted a month ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    a month ago
    Correct Option - 1


    Detailed Solution:

    R 1 = ? 1 l A R 2 = ? 2 l A

    1 R = 1 R 1 + 1 R 2 = A l [ 1 ? 1 + 1 ? 2 ]

    = 3 * 1 0 ? 6 1 4 [ 1 1 . 7 * 1 0 ? 8 + 1 2 . 6 * 1 0 ? 8 ]

    R = 0 . 8 5 8 * 1 0 ? 3 ?

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