Question:

A dip needle arranged to move freely in the magnetic meridian dips by an angle θ\theta. If the vertical plane in which the needle moves is rotated through an angle α\alpha to the magnetic meridian, then the needle will dip by an angle

Updated On: Jun 23, 2023
  • θ\theta
  • α\alpha
  • more than θ\theta
  • less than θ\theta
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The Correct Option is C

Solution and Explanation

In this question, cosα<1\cos \alpha<1
i.e., 1cosα>1\frac{1}{\cos \alpha}>1
or, tanθtanθ>1\frac{\tan \theta '}{\tan \theta}>1
or, tanθ>tanθ\tan \theta ' > \tan \theta
or, θ>θ\theta ' >\theta
ie, angle of apparent dip is more than angle of actual dip θ\theta.
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