AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
The magnetic field lines around a long straight current-carrying conductor are concentric circles centred on the wire, lying in planes perpendicular to the conductor.
Source: Chapter 12, Section 12.2.2 / Exercises Q1(d)
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The key term examiners expect is "concentric circles". The distractor options (straight lines parallel/perpendicular, or radial lines) are commonly tested, so be precise. Exercise Q1 directly tests this — the correct answer is (d), confirming the expected wording.