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JEE Main20249 Apr 2024Morning ShiftPhysicsCurrent ElectricityActual

A galvanmeter has a coil of resistance 200 with a full scale deflection at 20 A . The value of resistance to be added to use it as an ammeter of range (0-20) mA is ;

Options

  1. A0.40
  2. B0.20
  3. C0.50
  4. D0.10

Correct answer

B. 0.20

Step-by-step solution

aligned & G =200 & i _ g =20 A & i = i _ g ( G S +1 ) & 20 10⁻³=20 10⁻⁶ ( 200 ~S +1 ) & 200 ~S =999 & S 0.2 aligned

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