Question 4

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

• (a)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
• (b)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
• (c)The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet
• (d)The N- and S-poles exchange position when the direction of current through the solenoid is reversed