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The magnetic lines of force around a long, straight current-carrying conductor are best described as:
AStraight lines lying in a plane that contains the conductor
BParallel straight lines running along the conductor on all sides
CConcentric circles in a plane perpendicular to the conductor
DStraight lines radiating outward away from the conductor
Answer & Solution
Correct answer: C. Concentric circles in a plane perpendicular to the conductor
1. Iron filings sprinkled around a straight current-carrying wire arrange themselves in circles.
2. The chapter states the magnetic lines of force form concentric circles with the wire as centre, in a plane perpendicular to the conductor.
3. The option parallel-to-the-wire lines describe a solenoid's interior, not a straight conductor's field.
4. The option radial straight lines describe an electric field of a charge, not this magnetic field.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 4 "Effects of Electric Current", p.70_
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