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A galvanometer having coil resistance 10 Ω shows a full scale deflection for a current of 3 mA. For it to measure a current of 8 A, the value of the shunt should be

Asked in JEE Main 29th Jan 2nd Shift 2024 · Conversion to ammeter and voltmeter

• (1) 4.85 × 10⁻³ Ω
• (2) 3.75 × 10⁻³ Ω
• (3) 2.75 × 10⁻³ Ω
• (4) 3 × 10⁻³ Ω

Step-by-step solution

Why the other options are wrong

• (1) Arithmetic slip in dividing 0.03 by 8.
• (3) Used I - I_g = 11 or similar wrong total current.
• (4) Used S = (I_gG)/(10), dividing by G instead of I.

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