## Magnetic Elements At A Place

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# Magnetic Elements at a Place

Earth behaves as a magnet. The declination (α), the dip (δ), and the total intensity of earth’s magnetic field (B) are the three magnetic elements of earth’s magnetic field at a place. Declination gives the plane, dip gives the direction, and the intensity of magnetic field gives the magnitude of the earth’s magnetic field.Magnetic elements of earth’s magnetic field.

**(i) Magnetic declination.**The angle between magnetic meridian and geographical meridian at a place is called magnetic declination at that place. Its symbol is α.

ABEF is geographical meridian. ABCD is magnetic meridian. ∟FAD = α, is magnetic declination.

(ii) The angle between the direction of the earth’s magnetic field and the horizontal direction at a place is called the angle of dip (or merely dip) (δ) at that place.

(iii) Strength (intensity) of earth’s magnetic field. The strength (intensity) of earth’s magnetic field at a point in the field is defined as force acting on a unit north pole (test pole) kept at that pint in earth’s field. Its symbol is B.

## Horizontal component of earth’s magnetic field.

The strength (intensity) of earth’s magnetic field at a point in the field is defined as force acting on a unit north pole (test pole) kept at that point in earth’s field. Its symbol is BH.Hence, BH = B cos δ is along AD.

BH is sometimes taken as the third magnetic element in place of B.

## Vertical components of earth’s magnetic field.

The component of total intensity of earth’s magnetic field at a point, taken in the vertical there, is called the vertical component of earth’s magnetic field. Its symbol is Bv.BV = B sin δ is along AB.

Bv = BH = B sin δ/B cos δ = tan δ

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