For a current in a long straight solenoi...

For a current in a long straight solenoid, `N*` and `S-"poles"` are created at the two ends. Among the following statements, the incorrect statement is:

the magnetic field lines inside the solenoid are in the form of straight lines,which indicates that the magnetic field is uniform at all points inside the solenoid

the strong magnetic field produced inside the solenoid can magnetize the soft iron placed inside it.

the pattern of the magnetic field associated with a current carrying solenoid is different from the pattern of the magnetic field around a bar magnet

The N and S poles exchange positions when the direction of current through the solenoid is reversed.

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