Verified Solution • 2025–26 Session moderate

QPages 249-253: Q11: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Pages 249-253: Q11 Solution: Two long, straight wires, each carrying a current of 5 A, are…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often apply the right‑hand rule incorrectly by assuming the magnetic field from each wire has the same direction everywhere, forgetting that the field circles the wire and flips sign when crossing the wire’s plane; always determine the B‑direction for each wire at the specific quadrant before adding vectors.

Two long, straight wires, each carrying a current of 5 A, are placed along the x- and y-axis respectively. The currents point along the positive directions of the axes. Find the magnetic fields at the points a) 1 m, 1 m), b) -1 m, 1 m), c) -1 m, -1 m) and -1 m, -1 m) and d) 1 m, -1 m).

Step-by-Step Verified Solution

**Answer:** (a) 0 (b) 2×10−62 \times 10^{-6} T along +z (c) 0 (d) 2×10−62 \times 10^{-6} T along -z. **Step-by-Step Explanation:** Wires along x and y axes with 5 A each. At (1,1): fields cancel. At (-1,1): both fields along +z, B=2×10−6B = 2 \times 10^{-6} T. At (-1,-1): cancel. At (1,-1): both fields along -z, B=2×10−6B = 2 \times 10^{-6} T.

All Questions in this Chapter

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