Ratio between total intensity of magnetic field at equator to poles is
$1:1$
$1:2$
$2:1$
$1:4$
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
What is dynamo effect ?
The vertical component of the earth's magnetic field is zero at a place where the angle of dip is.....$^o$
A dip circle is adjusted so that its needle moves freely in the magnetic meridian. In this position, the angle of dip is $40°$. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of $30°$ with the magnetic meridian. In this position the needle will dip by an angle
The lines joining the places of the same horizontal intensity are known as