The magnetic needle of a tangent galvanometer is deflected at an angle $30^o$ due to a magnet. The horizontal component of the earth's magnetic field is $0.34 \times 10^{-4}\,T$ which is along the plane of the coil. The magnetic field due to magnet is

  • A

    $1.96 \times 10^{-4}\,T$

  • B

    $1.96 \times 10^{-5}\,T$

  • C

    $1.96 \times 10^{4}\,T$

  • D

    $1.96 \times 10^{5}\,T$

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