At a certain place the angle of dip is $30°$  and the horizontal component of earth's magnetic field is $0.50$  Oersted. The earth's total magnetic field is

  • A

    $\sqrt 3 $

  • B

    $1$

  • C

    $\frac{1}{{\sqrt 3 }}$

  • D

    $\frac{1}{2}$

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