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MHT CET Medical202624 April 2026Evening ShiftPhysicsCurrent ElectricityActual

The range of voltmeter is 10 V and its resistance is 50 . To convert it to a voltmeter of range 15 V , how much resistance is to be added?

Options

  1. A25 resistor in parallel.
  2. B25 resistor in series.
  3. C125 resistor in parallel.
  4. D125 resistor in series.

Correct answer

B. 25 resistor in series.

Step-by-step solution

Current for full scale deflection of the voltmeter is given by I_g = V₁ R_v . Substituting the given values, I_g = 10 50 = 0.2 A . To increase the range of the voltmeter to V₂ = 15 V , a resistance R must be connected in series with it. The new range is given by V₂ = I_g(R_v + R) . Substituting the values, 15 = 0.2(50 + R) . 50 + R = 15 0.2 = 75 R = 75 - 50 = 25 . Thus, a 25 resistor must be connected in series. Answer: 25 resistor in series.

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