Explain magnetic declination.
Explain magnetic declination.
A magnetic needle, which is free to swing horizontally would then lie in the magnetic meridian and the north pole of the needle would point towards the magnetic north pole.
The angle between north direction shows by magnetic needle and true north direction at any place is called magnetic declination at that place.
The angle between the geographic meridian and magnetic meridian at a place is called magnetic declination.
The declination is larger at higher latitudes and smaller near the equator.
The declination in India is small, it being $0^{\circ} 41^{\prime} \mathrm{E}$ at Delhi and $0^{\circ} 58^{\prime} \mathrm{W}$ at Mumbai. Thus, at both these places a magnetic needle shows the true north quite accurately.
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The horizontal component of the earth's magnetic field is $0.22$ $Gauss$ and total magnetic field is $0.4$ $Gauss$. The angle of dip. is
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