NEET 2026 (Phase 1) · PhysicsAmmeter shuntPrevious Year Question
A galvanometer of resistance 100 Ω gives full scale deflection for a current of 1 mA. It is converted into an ammeter of range 0 – 10 A. The shunt required is:
- A.0.01 Ω✓
- B.0.10 Ω
- C.1.0 Ω
- D.0.001 Ω
Correct Answer
(A) 0.01 Ω
Solution & Explanation
Answer: (A) Solution: The shunt carries the excess current; same voltage across galvanometer and shunt: I_g R_g = (I − I_g) R_s. R_s = I_g R_g / (I − I_g) = (10⁻³ × 100) / (10 − 10⁻³) R_s = 0.1 / 9.999 ≈ 0.01 Ω.
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