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A dip needle arranged to move freely in ...

A dip needle arranged to move freely in the magnetic meridian dips by angle 0. If the vertical plane in which the needle moves is rotated through an angle a to the magnetic meridian than the needle will dip by an angle

Text Solution

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If the apparaent dip is `delta` the true , dip is `delta` and the angle of rotation of plane is `alpha` then
` cot delta = cot delta cos alpha`.
`therefore cot delta lt cot delta `
Thus the angle is less then `delta`.
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