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Magnetic field lines around a straight current-carrying wire are:
AStraight lines parallel to the wire
BConcentric circles around the wire
CRandom and disordered
DRadial lines pointing outward
Answer & Solution
Correct answer: B. Concentric circles around the wire
1. A straight current-carrying conductor produces a magnetic field in the surrounding space.
2. Iron filings sprinkled around the wire arrange themselves in concentric circles.
3. The centre of each circle lies on the wire itself.
4. So the field lines form concentric circles around the wire.
_Source: NCERT Class 10 Science Ch 13 'Magnetic Effects of Electric Current' (learncbse.in extract)_
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