The lines joining the places of the same horizontal intensity are known as
Isogonic lines
Aclinic lines
Isoclinic lines
Isodynamic lines
At which place, earth's magnetism become horizontal
A dip needle lies initially in the magnetic meridian when it shows an angle of dip $\theta $ at a place. The dip circle is rotated through an angle $x$ in the horizontal plane and then it shows an angle of dip $\theta '$. Then $\frac{{\tan \theta '}}{{\tan \theta }}$ is
Two short bar magnets of magnetic moments $m$ each are arranged at the opposite corners of a square of side $d$ such that their centres coincide with the corners and their axes are parallel. If the like poles are in the same direction, the magnetic induction at any of the other corners of the square is
Angle of dip is $90^o$ at
If a magnet is hanged with its magnetic axis then it stops in