If the dip circle is set at $45^{\circ}$ to the magnetic meridian,then the apparent dip is $30^{\circ}$. The true dip of the place is:

  • A
    $\tan^{-1}\left(\frac{1}{\sqrt{3}}\right)$
  • B
    $\tan^{-1}\left(\frac{1}{\sqrt{6}}\right)$
  • C
    $\tan^{-1}\left(\frac{2}{\sqrt{3}}\right)$
  • D
    $\tan^{-1}\left(\frac{\sqrt{3}}{2}\right)$

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Give information about Earth's magnetism.

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At the place where the angle of dip is $60^{\circ}$,what is the relation between the vertical component $Z_{E}$ and the horizontal component $H_{E}$ of the Earth's magnetic field?

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