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A galvanometer has a resistance G and a ...

A galvanometer has a resistance G and a current flowing in it produces full scale deflection. `S_1` is the value of the shunt, which converts it into an ammeter of range `0-I` and `S_2` is the value of the shunt for the range `0-2I`. The ratio is

A

2

B

1

C

`S_1/S_2 = ((2I-I_a)/(I-I_a))`

D

`S_1/S_2 = 1/2((I-I_a)/(2I-I_a))`.

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