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NTA Abhyas JEE Main2020PhysicsCurrent ElectricityPractice

A voltmeter with a resistance 50 × 10 3 Ω is used to measure voltage in a circuit. To increase its range to 3 times, the additional resistance to be put in series is

Options

  1. A9 × 10 6 Ω
  2. B10 5 Ω
  3. C1.5 × 10 5 Ω
  4. D9 × 10 5 Ω

Correct answer

B. 10 5 Ω

Step-by-step solution

V = i g R a n d V ′ = i g R ′ o r R ′ R = V ′ V Or R ′ = V ′ V R = 3 V V × 50 × 10 3 = 1.5 × 10 5 Ω ∴ Additional resistance = 1.5 × 10 5 - 0.5 × 10 5 = 10 5 Ω

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