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NEET2018PhysicsCurrent ElectricityActual

Current sensitivity of a moving coil galvanometer is 5  d i v / m A and its voltage sensitivity (angular deflection per unit voltage applied) is 20  d i v / V . The resistance of the galvanometer is

Options

  1. A250 Ω
  2. B25 Ω
  3. C40 Ω
  4. D500 Ω

Correct answer

A. 250 Ω

Step-by-step solution

θ i = 50 10 - 3 = 5000 , θ V = 20 ⇒ θ / i θ / V = 5000 10 = 250 ⇒ V i = R = 250 Ω ( ∵ Voltage sensitivity = current sensitivity Resistance )

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