The horizontal component of the earth's magnetic field is $0.22$ $Gauss$ and total magnetic field is $0.4$ $Gauss$. The angle of dip. is
${\tan ^{ - 1}}\,(1)$
${\tan ^{ - 1\,}}(\infty )$
${\tan ^{ - 1\,}}(1.518)$
${\tan ^{ - 1\,}}(\pi )$
The angle of dip is the angle
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 angle of dip at the place is ............
Two normal uniform magnetic field contain a magnetic needle making an angle $60°$ with $F$. Then the ratio of $\frac{F}{H}$ is
The angle between the magnetic meridian and geographical meridian is called
A magnet is suspended in the magnetic meridian with an untwisted wire. The upper end of wire is rotated through $180^o$ to deflect the magnet by $30^o$ from magnetic meridian. When this magnet is replaced by another magnet, the upper end of wire is rotated through $ 270^o$ to deflect the magnet $30^o$ from magnetic meridian. The ratio of magnetic moments of magnets is