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

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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

The strong magnetic field produced inside the solenoid can be used to magnetize a piece of a magnetic material like soft iron when placed inside the coil

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

The N- and S-poles exchange position when the direction of current through the solenoid is reversed

answer is C.

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Detailed Solution

Magnetic field lines inside the solenoid are denser compared to those outside the solenoid. Also, the field lines are closed, similar to the bar magnet. Hence the pattern of the magnetic field associated with solenoid is different from the pattern of the magnetic field around a bar magnet .

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