Question

The isoclinic lines on magnetic map represent line of
A. zero dip
B. equal declination
C. equal dip
D. equal horizontal field

Answer 1

Hint: A magnetic map is a map which shows us the intensity of the magnetic field on the surface of earth in different places. We have some lines in a magnetic map which joins some specific points in the map. Obtain the information about these specific lines.

Complete step by step answer:
A magnetic map is obtained by drawing lines over the surface of earth where they have the same magnetic elements. In a magnetic map a magnetic line can pass through different places over the earth which have the same magnetic elements.
Magnetic maps show us the intensity of the magnetic field in a place. The magnetic field is a vector field but in the magnetic maps, only the magnitude of the vector is measured and shown in the maps.
For different places on earth, the magnetic maps or the declination, dip and the horizontal components vary in magnitude. But, some places on earth have the same value of magnetic elements.
The lines on a magnetic map are drawn joining all the places on the earth having the same amounts of magnetic elements. These lines altogether form the magnetic map.
Now, dip or magnetic inclination is the angle between the direction of total magnetic field of earth and a horizontal line in magnetic meridian.
Magnetic declination is the angle between the magnetic meridian and geographic meridian at a place.
The isoclinic lines in a magnetic map define the line joining the points on the magnetic map with equal dip or inclination.

So, the correct answer is “Option C”.

Note: We have five different lines in a magnetic map. Isogonic lines join the points of equal declination, agonic lines pass through points of zero declination, isoclinic lines joins the points of equal dip or inclination, aclinic lines join the places of zero dip and isodynamic lines joins the places of same horizontal field.