The earth's magnetic field was flipped by $180^{\circ}$ a million years ago. This flip was relatively rapid and took $10^5 \,yrs$. Then, the average change in orientation per year during the flip was closest to ............ $s$
$1$
$5$
$10$
$30$
The value of angle of dip is zero at the magnetic equator because on it
Give information about the Earth’s magnetic field lines and the location of the magnetic poles.
The angle between the magnetic meridian and geographical meridian is called
At a certain place the angle of dip is $30°$ and the horizontal component of earth's magnetic field is $0.50$ Oersted. The earth's total magnetic field is
Ratio between total intensity of magnetic field at equator to poles is