Explain the magnetic fields of the Earth. and Give the value of magnified of earth.
Explain the magnetic fields of the Earth. and Give the value of magnified of earth.
To describe the magnetic field of the earth at a point on its surface, we need to specify three quantities.
$(i)$ The declination $D$
$(ii)$ The angle of dip or the inclination $I$
$(iii)$ The horizontal component of Earth's field $\mathrm{H}_{\mathrm{E}}$
$(iv)$ The vertical component of earth's field $Z_{E}$
All these are known as the elements of the earth's magnetic field.
From figure,
$\mathrm{H}_{\mathrm{E}}=\mathrm{B}_{\mathrm{E}} \cos \mathrm{I}...(1)$
$\mathrm{Z}_{\mathrm{E}} =\mathrm{B}_{\mathrm{E}} \sin \mathrm{I}....(2)$
$\therefore \quad \tan \mathrm{I}=\frac{\mathrm{Z}_{\mathrm{E}}}{\mathrm{H}_{\mathrm{E}}}...(3)$
$\text { and } \mathrm{B}_{\mathrm{E}}=\sqrt{\mathrm{H}_{\mathrm{E}}^{2}+\mathrm{Z}_{\mathrm{E}}^{2}}...(4)$
Of the order of $10^{-5} \mathrm{~T}$
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