In a long straight solenoid,
Question:

In a long straight solenoid, N-and S-poles are created at the two ends of the solenoid. Which of the following statements is incor¬rect ?

(a) The field lines inside the solenoid are in the form of straight lines indicating that magnetic field is same at ail points inside the solenoid.

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

(c) N-and S-poles exchange positions when the direction of the current through the solenoid is reversed.

(d) Magnetic field produced inside the solenoid can be used to magnetise a bar of magnetic material like soft iron, when placed inside the solenoid.

Solution:

(b).

Explanation : The pattern of magnetic field produced by a cur¬rent carrying solenoid resembles with the pattern of magnetic field of a bar magnet.

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