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JEE Main202624 January 2026Evening ShiftPhysicsCurrent ElectricityActual

A moving coil galvanometer of resistance 100 shows a full scale deflection for a current of 1 mA. The value of resistance required to convert this galvanometer into an ammeter, showing full scale deflection for a current of 5 mA, is _ _ _ _

Options

  1. A0.5
  2. B2.5
  3. C10
  4. D25

Correct answer

D. 25

Step-by-step solution

To convert a galvanometer to an ammeter, a shunt resistance S is connected in parallel. For full-scale deflection: Current through galvanometer: I_g = 1 mA Total current: I = 5 mA Current through shunt: I_s = 5 - 1 = 4 mA Since voltage across both is equal: I_g G = I_s S 0.001 100 = 0.004 S S = 0.1 0.004 = 25 Ω

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