If magnetic lines of force are drawn by keeping magnet vertical, then number of neutral points will be

At a certain location in Africa, a compass points $12^{\circ}$ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points $60^{\circ}$ above the horizontal. The horizontal component of the earth's field is measured to be $0.16 \;G$. Specify the direction and magnitude of the earth's field at the location.

Define angle of dip. and Write the definition of declination.

At an angle of $30^{\circ}$ to the magnetic meridian, the apparent dip is $45^{\circ} .$ Find the true dip :

A short bar magnet is placed in the magnetic meridian of the earth with north pole pointing north . Neutral points are found at a distance of $30\, cm$ from the magnet on the East - West line, drawn through the middle point of the magnet. The magnetic moment of the magnet in $Am^2$ is close to: (Given $\frac{{{\mu _0}}}{{4\pi }}\, = 10^{- 7}$ in $SI\,units$ and $B_H\, =$ Horizontal component field $= 3.6\times10^{-5}\, tesla$)

At a point on the surface of the earth, the value of the horizontal component of earth's magnetic field is equal to value of vertical magnetic component of earths magnetic field the angle of dip is