The figure below show a coil wound on a soft iron core P , and an identical coil wound on a steel core Q .Five nails attracted to each of them when the current is on . The switches are then opened .The probable number of nails still attracted to P and Q are
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The magnetic fields produced by the solenoid are similar to the magnetic field produced by a magnet. As shown in the figure, polarity of a magnetic pole in a solenoid is south pole if current is flowing clockwise and north pole if current flows anti-clockwise. Polarity can also be found using right-hand thumb rule.
Thus, the polarity of the solenoid XY at X is south pole and at Y is north pole.
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