Terrestrial Magnetism Flashcards
The North seeking end of a magnet is called?
The Red pole
The South seeking end of a magnet is called?
The Blue pole
Considering polarity, magnetic flux flows from the north pole to the south pole:
Outside of the magnet
Considering polarity, magnetic flux flows from the south pole to the north pole:
Inside of the magnet
At what point on the earth surface geographically will magnetic dip = zero?
Magnetic dip is zero at the magnetic equator and increases as the latitude increases (north or south)
The horizontal magnetic component is maximum at the?
Magnetic Equator
Lines joining places of equal magnetic dip is called?
Isoclinals
Lines joining places with zero magnetic dip is called?
Aclinic Line
Line joining places of equal horizontal force is called?
Isodynes
Isogonals are lines joining places of?
Equal magnetic variation
Agonic Line are lines joining places of?
Zero magnetic variation
The cause of Daily, Annual and 11 year periodic change is caused by?
The sun
Magnetic flux possesses polarity, which is a word to describe?
The flow of flux from the north pole to the south outside the magnet, and flow from the south pole to the north pole inside the magnet
An iron bar can be magnetised by wrapping a cylindrical coil around it and passing?
a Direct Current through the bar
An iron can be demagnetised how?
By passing an AC current through the bar continually, the continuous reverse polarity will demagnetise the bar.
The type of iron that is capable of being only magnetised when passing DC through it?
Soft Iron
At the magnetic equator the magnetic field is?
Horizontal
At the magnetic poles the magnetic field is?
Vertical
In an aircraft, the compass aligns itself with the?
Horizontal field, or magnetic meridian.
The directive force is due to?
The horizontal field
Magnetic intensity is?
The total total force at any given moment, it is the strength of the Earth’s Total Field (T).
Yearly change of variation is called?
Secular change of variation
