The horizontal component of the earth's ...

The horizontal component of the earth's magnetic field is `3.6 xx 10^(-5) T` where the dip is `60^@`. Find the magnitude of the earth's magnetic field.

`2.8xx10^(-4)" tesla"`

`2.1xx10^(-4)" tesla"`

`7.2 xx10^(-5)" tesla"`

`3.6xx10^(-5)" tesla"`

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