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A.T.G. gives a deflection of 30^(@) for ...

A.T.G. gives a deflection of `30^(@)` for a certain current at one place and a deflection of `45^(@)` at another place . The values of the horizontal component of the earth's fields at the two places and in the ratio of

A

`1 : sqrt3`

B

`3 : sqrt2`

C

`2 : sqrt3`

D

`sqrt3 : 1`

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The correct Answer is:
D
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