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In a meter bridge experiment, the galvanometer shows a null point when jockey is pressed at 40.0cmusing a standard resistance of 100   Ω as per the diagram. The least count of the scale used is 1 mm. The unknown resistance is nearly

Option 1 -

  ( 6 6 . 7 ± 0 . 1 ) Ω

Option 2 -

( 6 6 . 7 ± 0 . 3 ) Ω

Option 3 -

( 3 3 . 3 ± 0 . 1 ) Ω

Option 4 -

( 3 3 . 3 ± 0 . 3 ) Ω

0 2 Views | Posted a month ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    a month ago
    Correct Option - 2


    Detailed Solution:

    ⇒ R 1 0 0 = 4 0 6 0

    ⇒ Δ R = ( Δ l l + Δ l ( 1 0 0 − l ) ) R

    = ( 0 . 1 4 0 + 0 . 1 6 0 ) × 6 6 . 7 = 0 . 2 7 = 0 . 3

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