Question

The lines joining points of equal dip are called
1. Aclinic lines
2. Isogonic lines
3. Agonic lines
4. Isoclinic lines

Answer 1

Correct Answer - Option 4 : Isoclinic lines

Concept:

Dip:

• It is the inclination of the magnetic needle with the horizontal. The dip is zero at the equator and the needle will remain horizontal.
• At a place near 70° north latitude and 96° west longitude, the dip will be 90°. This area is called the magnetic north pole. Similarly, near the south magnetic pole, the dip is 90°.

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Declination: 

• It is the angle between the magnetic and geographic meridians or the angle in the horizontal plane between magnetic north and true north.

Explanation:

Magnetic Lines	Definition
Agonic Line	The line joining the places of zero declination.
Aclinic Line	The line joining the places of zero dip
Isoclinic Line	The line joining the places of the same dip
Isogonic lines	Isogonic are the lines joining points of equal declination at a time of observation.