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A galvanometer is used in laboratory for detecting, the null point in electrical experiments. If, on passing a current of 6 mA it produces a deflection of 2°, its figure of merit is close to

Asked in JEE Main 5th Sept 2nd Shift 2020 · Galvanometer sensitivity and figure of merit

• (1) 333° A/div
• (2) 6 × 10⁻³ A/div
• (3) 666° A/div
• (4) 3 × 10⁻³ A/div

Step-by-step solution

Why the other options are wrong

• (1) Computed deflection per ampere (current sensitivity) instead of current per division.
• (2) Forgot to divide by the 2 divisions.
• (3) Computed divisions per ampere and doubled it.

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