To find the resistance of a galvanometer by the half deflection method the following circuit is used with resistances R 1 = 9970 W , R 2 = 30 W and R 3 = 0 . The deflection in the galvanometer i

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To find the resistance of a galvanometer by the half deflection method the following circuit is used with resistances $R_{1} = 9970 W, R_{2} = 30 W$ and $R_{3} = 0$ . The deflection in the galvanometer is d. With $R_{3} = 107 W$ the deflection changed to $\frac{d}{2}$ . The galvanometer resistance is approximately:

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