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Which of the following is independent qu...

Which of the following is independent quantities is no used to specify the earth's magnetic field?

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1. Angle of declination `(theta)`. Angle of declination at a place is the angle between the geographic meridian and the magnetic meridian.
2. Angle of inclination or angle of dip `(delta)`. Angle of inclination or Dip at a place is the angle made by the direction of the intensity of earth.s total magnetic field with the horizontal direction.

3. Horizontal component of earth.s magnetic field `(B_(H))`. It is the component of earth.s magnetic field along the horizontal direction e.g. in the fig. it is along AL.
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