In a moving coil galvanometer, two moving coils M₁ and M₂ have the following particulars : aligned & R ₁=5 , ~N ₁=15, ~A ₁=3.6 10⁻³ ~m ^2, ~B ₁=0.25 ~T & R ₂=7 , ~N ₂=21, ~A ₂=1.8 10⁻³ ~m ^2, ~B ₂=0.50 ~T aligned Assuming that torsional con

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In a moving coil galvanometer, two moving coils M₁ and M₂ have the following particulars : aligned & R ₁=5 , ~N ₁=15, ~A ₁=3.6 10⁻³ ~m ^2, ~B ₁=0.25 ~T & R ₂=7 , ~N ₂=21, ~A ₂=1.8 10⁻³ ~m ^2, ~B ₂=0.50 ~T aligned Assuming that torsional constant of the springs are same for both coils, what will be the ratio of voltage sensitivity of M₁ and M₂ ?

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Correct answer: A. 1: 1

aligned & Voltage sensitivity = V = N A B c R & Ratio == ( N ₁ ~A ₁ ~B ₁ ~N ₂ ~A ₂ ~B ₂ ) R ₂ R ₁ = 15 3.6 0.25 21 1.8 0.5 7 5 = 1 1 aligned

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