A magnetic needle free to rotate in a vertical plane orients itself
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At the two magnetic poles, the magnetic needle rests vertically.
Hence, at poles, δ = 900
As, Horizontal component, H= R cos δ = 00
And at a place on the magnetic poles, earth's magnetic field is perpendicular to the surface of earth, i.e., vertical.
Therefore, angle of dip (δ) = 900
The angle that a magnetic needle makes with the horizontal plane at any specific location is dip angle.
Hence, at poles, δ = 900
As, Horizontal component, H= R cos δ = 00
And at a place on the magnetic poles, earth's magnetic field is perpendicular to the surface of earth, i.e., vertical.
Therefore, angle of dip (δ) = 900
The angle that a magnetic needle makes with the horizontal plane at any specific location is dip angle.
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A magnetic needle free to rotate in a vertical plane. A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its North tip down at 60° with the horizontal. Thehorizontal component of the earth's magnetic field at the place is known to be 0.4 gauss.
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