Q1. [1] § 12.2.4 Magnetic Field due to a Current in a Solenoid
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 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.
- (b) The strong magnetic field produced inside the solenoid can magnetize the soft iron placed inside it.
- (c) 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.
- (d) The N and S poles exchange positions when the direction of current through the solenoid is reversed.
Previously asked in CBSE board exam
2023 31/5/1 Q16
Generated by claude-sonnet-4-6 · 2026-06-15 06:49 · grounding rag
Model Answer
The incorrect statement is (c).
The magnetic field pattern of a current-carrying solenoid is similar (not different) to that of a bar magnet, as stated in the textbook.
Explanation
The passage explicitly says: "Compare the pattern of the field with the magnetic field around a bar magnet… they are similar." Options (a), (b), and (d) are all correct facts from the chapter. Examiners expect you to directly identify the contradiction with the textbook statement. Source: Chapter 12, Section 12.2.4.
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