Answer:
A solenoid has a large number of
close, insulated circular turns. The magnetic field at the centre of current-carrying
circular wire is along the axis; so when current is passed in a solenoid, the
magnetic fields due to all circular turns are added and hence the field lines
become similar to the field lines for a bar magnet.
Yes,
we can determine the north and south poles of a current-carrying solenoid with
the help of a bar magnet. For this, we suspend the bar magnet freely and note
its ends pointing along north and south directions and mark on these ends N (North
Pole) and S (South Pole).
Now
we bring N-pole near one end of freely suspended current-carrying solenoid; if
there is repulsion, then that end of solenoid is N-pole and other S-pole; but
if there is attraction, then the end of solenoid is S-pole and the other is
N-pole.
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