At a certain location in Africa, a compass points $12^o$ West of the geographic North. The North tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points $60^o$ above the horizontal. The horizontal component of the earth's field is measured to be $0.16\, G$. The magnitude of the earth's field at the location will be

  • A

    $0.23\times10^{-4}\, T$

  • B

    $0.18\times10^{-4}\, T$

  • C

    $0.32\times10^{-4}\, T$

  • D

    $0.81\times10^{-4}\, T$

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