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Question

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?

This question was previously asked in
CDS 2 2026 Maths Question Paper (13-Sep-2026)
The correct answer is

Magnetic field at point 2 is zero

Two long, closely spaced wires carrying equal and opposite currents act like a magnetic dipole pair. At the midpoint between them, the fields due to the two oppositely directed currents point the same way and add up, so the field there is not zero. Far away from the wires, however, the fields from the two opposite currents almost cancel out because of the tiny separation, so the net magnetic field at point 2 is effectively zero.

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