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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:

Asked in NEET 2026 · Conversion to ammeter and voltmeter

• (1) 0.10 Ω
• (2) 0.001 Ω
• (3) 1.0 Ω
• (4) 0.01 Ω

Step-by-step solution

Why the other options are wrong

• (1) Ten times too large: it is (I_g G)/(1 A), dividing by 1 A instead of the 10 A the shunt must carry.
• (2) This is the full-scale current in amperes, 0.001 A, written as a resistance.
• (3) No single slip gives 1.0 Ω; with that shunt the full-scale reading would be only 0.001×(1+(100)/1)≈0.1 A.

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