At a given place on the Earth,the angle between the Magnetic Meridian and the Geographic Meridian is called . . . . . . .

The relations among the three elements of Earth's magnetic field,namely horizontal component $H$,vertical component $V$,and angle of dip $\delta$ are,($B_{E} =$ total magnetic field):

At a place,if the earth's horizontal and vertical components of magnetic fields are equal,then the angle of dip will be.......$^o$

The values of the apparent angles of dip in two planes at right angles to each other are $45^{\circ}$ and $30^{\circ}$ respectively. The true value of the angle of dip at the place is ............

In India,the magnetic declination at Delhi is . . . . . . .

The ratio between the total intensity of the magnetic field at the equator to the poles is: