Answer the question regarding earth's magnetism:
If you made a map of magnetic field lines at Melbourne in Australia, would the lines seem to go into the ground or come out of the ground?

Answer the following questions regarding earth's magnetism If a map of magnetic field lines is prepared at Melbourne in Australia , would the lines seem to go into the ground or come out of the ground .

A short bar magnet is placed with its north towards north of the earth. A neutral point is obtained on its equational line at a distance of 0.15 m from the centre of the magnet. If the horizontal component of the earth's magnetic field is 0.34 G, find the magnetic dipole moment of the magnet.

A long straight horizontal cable carries a current of 2.5 A in the direction from 10^(@) in the magnetic meridian of the place happens to be 10^(@) west of the geographic meridian . The earth's magnetic field at the location is 0.33 g and angle of dip is zero . Locate the line of neutral point . (ignore the thickness of the cable .)

A charged particle enters an environment of a strong and non-uniform magnetic field varying from point to point both in magnitude and direction, and comes out of it following a complicated trajectory. Would its final speed equal to initial speed if it suffered no collision in the environment ?