Question

Isogonic lines are those for which ______.

विकल्प

• Declination is the same at all places on the line.

• Angle of dip is the same at the place on the line. 

• The value of horizontal component of earth's magnetic field is the same 

• All of the above

Answer 1

Isogonic lines are those for which declination is the same at all places on the line.