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In the figure shown below, the maximum and minimum possible unknown resistance (X), that can be measured by the post office box are Xmax and Xmin respectively. Then the ratio of these two resistances is: (In this experiment, we take out only one plug in arm AB and only one plug in arm BC, but in arm AD we can take any no. of plugs):

In the figure shown below, the maximum and minimum possible unknown resistance (X), that can be measured by the post office box are Xmax and Xmin respectively. Then the ratio of these two resistances is: (In this experiment, we take out only one plug in arm AB and only one plug in arm BC, but in arm AD we can take any no. of plugs):

 

Option 1 -

3 * 105

Option 2 -

5 * 105

Option 3 -

7 * 105

Option 4 -

9 * 105

0 2 Views | Posted 2 months ago
Asked by Shiksha User

  • 1 Answer

  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    2 months ago
    Correct Option - 4


    Detailed Solution:

      P Q = R X         X m a x = R m a x . Q m a x P m i n

    = 9 0 0 0 × 1 0 0 0 1 0 = 9 × 1 0 5 o h m

    x m i n = R m i n . Q m i n P m a x = 1 0 0 × 1 0 1 0 0 0 = 1 o h m  

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