Verified Solution • 2025–26 Session moderate

QPage 248: Q8: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Page 248: Q8 Solution: Two wires carrying equal currents each, are placed…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume the wires will immediately attract or repel based on a single point interaction, ignoring that the magnetic field from the fixed wire is perpendicular to the free wire, creating a torque that must first align them parallel before net attraction occurs.

Two wires carrying equal currents ii each, are placed perpendicular to each other, just avoiding a contact. If one wire is held fixed and the other is free to move under magnetic forces, what kind of motion will result?

Step-by-Step Verified Solution

**Answer:** The free wire will tend to rotate and become parallel to the fixed wire, and then move towards it (attraction). **Step-by-Step Explanation:** The magnetic field due to the fixed wire is perpendicular to the plane of the free wire. The forces on different parts of the free wire create a torque that tends to align it parallel to the fixed wire. Once parallel, the currents are in the same direction, causing attraction.

All Questions in this Chapter

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