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Two tangent galvonometers A and B are id...

Two tangent galvonometers A and B are identical except in their number of truns. They are connected in series. On possing a current through them, deflectors of `60^@` and `30^@` are produced. The ratio of the number of turns in A and B is

A

`2 : 1`

B

`1 : 2`

C

`3 : 1`

D

`1 : 3`.

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