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A moving coil galvanometer of resistance 50 is connected with a shunt resistance of 2 to convert it into an ammeter. If the ammeter can measure a maximum current of 1.3 A, the full scale deflection current of the galvanometer is

Options

  1. A52 mA
  2. B50 mA
  3. C1250 mA
  4. D1300 mA

Correct answer

B. 50 mA

Step-by-step solution

Let the full scale deflection current of the galvanometer be I_g . Given: Galvanometer resistance, G = 50 Shunt resistance, S = 2 Maximum current, I = 1.3 A Since the galvanometer and the shunt are connected in parallel, the potential difference across them must be equal: I_g G = (I - I_g) S I_g 50 = (1.3 - I_g) 2 50 I_g = 2.6 - 2 I_g 52 I_g = 2.6 I_g = 2.6 52 = 0.05 A Converting to milliamperes: I_g = 0.05 1000 = 50 mA Answer: 50 mA

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