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

1. 1 : 2
2. 1 : 3
3. 1 : 4
4. 1 : 1

Correct answer: 1 : 1

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