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A multi range current ammeter can be constructed by using a galvanometer circuit as shown in figure. We want a current meter that can measure 10 mA, 100 mA and 1A using a galvanometer of resistance 10 Ω and that produces maximum deflection for current 1 mA. Value of S1 + S2 + S3 in ohms is

Option 1 -

1/9 Ω

Option 2 -

10/9 Ω

Option 3 -

100/999 Ω

Option 4 -

1/11 Ω

0 2 Views | Posted 3 weeks ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    3 weeks ago
    Correct Option - 2


    Detailed Solution:

    IgRc = (I - Ig) (S? + S? + S? )
    1mA × 10 = 9mA (S? + S? + S? )

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