Question

Isogonic lines are those for which

• A. declination is the same at all places on the line
• B. angle of dip is the same at the place on the line
• C. the value of horizontal component of earth's magnetic field is the same
• D. All of the above

Answer 1

Answer: (A)

Isogonic lines are the lines on the magnetic map joining the places of equal declination.