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Explain the elements of the Earth's magn...

Explain the elements of the Earth's magnetic field and draw a sketch showing the relationship between the vertical component, horizontal component and angle of dip.

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The magnetic field of the earth at a point on its surface can be specified by the declination D, the angle of dip or the inclination I and the horizontal component of the earth's field `H_(E)`. These are known as the elements of the earth's magnetic field.
Explanation :
(1) The total magnetic field at P can be resolved into a horizontal component `H_(E)` and a vertical component `Z_(E)`.
(2) The angle that `B_(E)` makes with `H_(E)` is the angle of dip I.
(3) Representing the vertical component by `Z_(E)`, we have `Z_(E) = B_(E) Sin I`
`H_(E) = B_(E) Cos I`
Which gives Tan `I = (Z_(E))/(H_(E))`
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