At which place Earth's magnetic field becomes horizontal?

At which place, earth's magnetism become horizontal?

At which place on the earth, the earth's magnetic field becoes horizontal?

What is the horizontal component of Earth's magnetic field? If the horizontal and vertical components of Earth's magnetic field are equal then what is the angle of dip?

A magnet suspended in earth's magnetic field can vibrated in horizontal plane. . A second magnet is so placed that the field becomes less than the horizontal component of earth's field. In this situatio, the time period will

At a place on earth the vertical component of earth's magnetic field is sqrt(3) times its horizontal component. The angle of dip at this place is …...