Lines which represent places of constant angle of dip are called

Lines joining places of equal angle of declination are called

Lines joining the places of equal Dip are called

At a place of latitude 5^@ , angle of dip is nearly

Lines joining the places of zero Dip' is called

At a place true dip angle is 60°. The apparent dip when plane of dip circle is at an angle of 30° with the magnetic meridian is

At a place true dip angle is 60°. The apparent dip when plane of dip circle is at an angle of 30° with the magnetic meridian is