For a current in a long straight solenoid N - pole and S - pole are created at the two ends. Among the following statements, the incorrect statement is
1
The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid
2
The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil
3
The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around bar magnet
4
The N – and S – poles exchange position when the direction of current through the solenoid is reversed