A galvanometer has a resistance of 25  Ω and a maximum of 0.01 A current can be passed through it. In order to change it into an ammeter of range 10 A, the shunt resistance required is

A galvanometer has a resistance of 25  Ω and a maximum of 0.01 A current can be passed through it. In order to change it into an ammeter of range 10 A, the shunt resistance required is

  1. A

    5/999  Ω

  2. B

    10/999  Ω

  3. C

    20/999  Ω

  4. D

    25/999  Ω

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    Solution:

    ig=i  SG+S    0.01=10S25+S   1000  S=25+S    S=25999Ω

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