Question

Inside the magnet, the direction of field lines is form
A. north to south pole
B. south to north pole
C. depends on position on the earth
D. none

Answer 1

Hint: Magnetic field lines are the lines surrounding a magnet which emerge from the north pole and terminate at the south pole, outside the magnet. Using this knowledge it is easier to figure out the direction of field lines inside the magnet.

Complete Step-by-Step solution:
Magnetic field lines are defined as the path which a north monopole would follow if it was free to move independently. These lines are present in the vicinity of a magnet. By convention, they emerge from the north pole (N) and form continuous loops and finally terminate at the south pole (S).

The density of these field lines are maximum around the poles and decrease as one moves further away from the magnet. Magnetic effect can be experienced at its greatest magnitude around the poles.
Inside the magnet however, these lines tend to move from south pole towards north pole. They are almost parallel to each other inside the magnet.
Hence the correct option is B: from south to north pole

Note: Magnetic field lines always form closed loops and they never ever intersect each other. The strength of the magnetic field is directly proportional to the closeness of the field lines. The direction of the field at a point is tangent to the magnetic field line at that point.