If the current is doubled, the deflection is also doubled in

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a moving coil galvanometer The current and deflection dependence of a moving coil galvanometer is given by i = k/(nAB)$\theta$ $\Rightarrow$ i ∝ $\theta$ Therefore, if we double the current, the deflection also gets doubled. However, in a tangent galvanometer, i ∝ tan $\theta$; that is, there is no direct relation between $\theta$ and current. Hence, the correct option is (b).

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