The intensity of the magnetic field due to the Earth at a point inside a hollow steel box is:

Define geographic meridian and magnetic meridian.

The angle of dip is $90^{\circ}$ at:

The true value of the angle of dip at a place is $60^o$. The apparent dip in a plane inclined at an angle of $30^o$ with the magnetic meridian is:

$A$ small bar magnet $A$ oscillates in a horizontal plane with a period $T$ at a place where the angle of dip is $60^o$. When the same needle is made to oscillate in a vertical plane coinciding with the magnetic meridian,its period will be

$A$ dip circle is at a right angle to the magnetic meridian. What will be the apparent dip in degrees?