সঠিক উত্তর হচ্ছে: Plane passing through the magnetic north and
magnetic south of Earth
ব্যাখ্যা:
Magnetic meridian is nothing but the vertical plane which passes through the axis of a freely suspended magnet. The direction of Earth’s magnetic field may not be horizontal and lies in the magnetic meridian. Magnetic meridian is an equivalent imaginary line connecting the magnetic south and north poles and can be taken as the horizontal component of magnetic force.