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A galvanometer, with a scale divided into 150 equal divisions, has current sensitivity of 10 divisions per milliampere and voltage sensitivity of 2 divisions per millivolt. Find shunt resistance for making an ammeter of 6 A .

Options

  1. A1.25 × 10 – 3 Ω
  2. B12.5 × 10 – 3 Ω
  3. C125 × 10 – 3 Ω
  4. D0.125 × 10 – 3 Ω

Correct answer

B. 12.5 × 10 – 3 Ω

Step-by-step solution

I g = 15 mA V g = 75 mV I = 6 A ⇒ R g = V g I g = 5 Ω S = I g R g I – I g = 12.5 × 10 – 3 Ω

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