How does a solenoid behave like a magnet? Can you determine the north and south poles of a current-carrying solenoid with the help of a bar magnet? Explain.

How does a solenoid behave like a magnet? Can you determine the north

1.	How does a solenoid behave like a magnet? Can you determine the north and south poles of a current-carrying solenoid with the help of a bar magnet? Explain.
Answer» Solution :A solenoid has a large number of close,insulated circular turns. The magnet 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 line becomes just as for a bar magnet. YES, we can determine the northand 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, butif there is attraction, then that end of solenoid is S-pole and the other is N-pole.