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When a current of 5 mA is passed through a galvanometer having a coil of resistance 15 Ω , it shows full-scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range 0 - 10 V is:

Options

  1. A4.005 × 10 3   Ω
  2. B1.985 × 10 3   Ω
  3. C2.045 × 10 3   Ω
  4. D2.535 × 10 3   Ω

Correct answer

B. 1.985 × 10 3   Ω

Step-by-step solution

∆ V = I g R g + R H 10 = 5 × 10 - 3 x + 15 x = 1.985 × 10 3   Ω

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