At places `A` and `B` using vibrating magnetometre, a magnet vibrates in a horizontal plane and its respective periodic time are 2 sec and 3 sec and at these places the earth's horizontal components are `H_(A)` and `H_(B)` respectively. Then the ratio between `H_(A)` and `H_(B)` will be
A
9:4
B
3:2
C
4:9
D
2:3
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The correct Answer is:
A
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