Home › UP Board Class 10 › physics › Magnetic Effects of Electric Current › Magnetic field lines around a straight current-c…
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)_
Related questions
Frequency of AC in India is:The Earth's magnetic field is roughly comparable to that of:Direction of force on a current-carrying conductor placed in a magnetic field is reversed An electromagnet differs from a permanent magnet in that the electromagnet:A short-circuit happens when:Earthing of an electrical appliance:The colour code in Indian household wiring is: live = red/brown, neutral = black/blue, earAC (Alternating Current) reverses its direction every: