The lines of force due to earth's horizontal component of the magnetic field are:
Parallel Straight lines
Concentric circles
Elliptical
Parabolic
As we learned
Magnetic field lines -
The magnetic field line is not real. It is only a concept developed as an aid to visualize the effect of a field.
-
Parallel & Straight lines are made by Earth's magnetic Horizontal
Study 40% syllabus and score up to 100% marks in JEE