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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