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Question

The angle of the dip, if a dip needle oscillating in a vertical plane makes 40 oscillations per minute in a magnetic meridian and 30 oscillations per minute in a vertical plane at right angle to the magnetic meridian, is:

A
θ=tan1(0.5625)
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B
θ=sin1(0.325)
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C
θ=sin1(0.425)
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D
θ=sin1(0.235)
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Solution

The correct option is A θ=tan1(0.5625)
We have,
ων=40/min
ωH=30/min
We know that, tanθ=(ωHων)2
tanθ=(3040)2
θ=tan1(0.75)2
θ=tan1(0.5625)

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