Q1. [1] § 12.2.4 Magnetic Field due to a Current in a Solenoid
Assertion (A) : The pattern of the magnetic field of a solenoid carrying a current is similar to that of a bar magnet.
Reason (R) : The pattern of the magnetic field around a current carrying conductor is independent of the shape of the conductor.
- A Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- B Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- C Assertion (A) is true, but Reason (R) is false.
- D Assertion (A) is false, but Reason (R) is true.
Previously asked in CBSE board exam
2025 31/5/1 Q19
Generated by claude-sonnet-4-6 · 2026-06-15 06:50 · grounding rag
Model Answer
Option C — Assertion (A) is true, but Reason (R) is false.
The magnetic field of a current-carrying solenoid is indeed similar to a bar magnet, but the pattern of magnetic field depends on the shape of the conductor, not is independent of it.
Explanation
- A is true: The textbook explicitly states "The magnetic field of a solenoid carrying a current is similar to that of a bar magnet."
- R is false: The textbook states "The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape of the conductor" — directly contradicting the Reason.
- So R does not explain A; in fact R is factually incorrect as per the chapter. Choose C.
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