and
(ii) continuity of lines of 
, to conclude
that inside a bar magnet, (a) lines of run
from the N pole to S pole, while (b) lines of must
run from the S pole to N pole.
Answer:
Consider a magnetic field
line of 
through the bar magnet as shown
in Fig. 3(EP). 17. It must be a closed loop. Let C be the amperian loop. Then
(i.e.,
positive)
It is so
because the angle between and 
is less than 90° inside the bar
magnet. So 
is positive. Hence, the lines of
must run from S pole to N pole
inside the bar magnet.
According
to Ampere's law, 
As 
so 
(i.e.,
negative)
It will be
so if angle between 
and is more than 90°, so that cos 
is negative. It means the line
of must run from N pole to S pole
inside the bar magnet.
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