Compare the direction of the magnetic field inside a solenoid with that of the field there if the solenoid is replaced by its equivalent combination of north pole and south pole.

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Solution

The direction of the magnetic field is the same in both cases, that is, inside a solenoid and inside a bar magnet. In a solenoid, magnetic field lines are directed from one end to the other internally and externally, so they are in the equivalent combination of north and south poles (as shown in figure).

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Statement 1: The magnetic field strength of a bar magnet is the maximum at its poles.

Statement 2: There is no magnetic field inside a current-carrying solenoid.

Q. 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

Q. Magnetic field lines appear to move from the South pole towards the North pole inside a magnet.

For a solenoid which is connected to an elctric supply, N and S poles are created at the two ends. Among the following statements, the correct statement/statements is/are:

Q. Direction of magnetic field inside a solenoid is along the axis of solenoid.

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