2026 · Q59
Two very thin and very long uniform wires, placed very close to each other, carry equal but opposite currents. Point 1 is exactly at the middle of those wires and point 2 is far away from the wires. Which one among the following regarding the net magnetic field produced is correct?
General KnowledgePhysics
- AMagnetic field at point 1 is zero
- BMagnetic field at point 2 is zero
- CMagnetic field lines will form elliptical loops around the wires
- DMagnetic field lines will form circular loops around the wires
Explanation
Two long wires carrying equal but opposite currents form a magnetic dipole: their fields add up between the wires (point 1 has a non-zero field) but cancel at large distances. Hence the net magnetic field at the far-away point 2 is effectively zero. The answer is (B).