The galvanometer deflection, when key K₁ is closed but K₂ is open, equals θ₀ (see figure). On closing K₂ also and adjusting R₂ to 5 Ω, the deflection in galvanometer becomes (θ₀/5)The resistance of the galvanometer is, then, given by
[Neglect the internal resistance of battery] :
(A) 5 Ω (B) 22 Ω
(C) 25 Ω (D) 12 Ω
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