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JEE Main20199 Apr 2019Morning ShiftPhysicsCurrent ElectricityActual

A moving coil galvanometer has resistance 50 Ω and it indicates full deflection at 4 m A current. A voltmeter is made using this galvanometer and a 5 k Ω resistance. The maximum voltage, that can be measured using this voltmeter, will be close to:

Options

  1. A40 V
  2. B15 V
  3. C20 V
  4. D10 V

Correct answer

C. 20 V

Step-by-step solution

V m a x = 4 × 10 - 3 × 50 + 4 × 10 - 3 × 5 × 10 3 V m a x = 20.2   V

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