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A milliammeter of range 0-30 mA has internal resistance of 20 Ω . The resistance to be connected in series to convert it into a voltmeter of maximum reading 3 V is

Options

  1. A49 Ω
  2. B80 Ω
  3. C40 Ω
  4. D30 Ω

Correct answer

B. 80 Ω

Step-by-step solution

R = V I g - G = 3 30 × 10 - 3 - 20 = 10 2 - 20 = 80 Ω

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