Verified Solution • 2025–26 Session moderate

QPage 248: Q1: Magnetic Field Due to a Current Solutions — HC Verma: Concepts of Physics - Volume 2

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often reverse the curl direction when applying the right‑hand rule, especially after rotating the hand to view east‑west or above‑below positions; remember the thumb points along the current (north→south) and the fingers curl in the actual direction of $\mathbf B$, so at a point east of the wire the field points south, west of it north, above it west, and below it east.

An electric current flows in a wire from north to south. What will be the direction of the magnetic field due to this wire at a point a) east of the wire, b) west of the wire, c) vertically above the wire and d) vertically below the wire?

Step-by-Step Verified Solution

**Answer:** (a) South (b) North (c) West (d) East. **Step-by-Step Explanation:** Current flows from north to south. Using the right-hand thumb rule (thumb in direction of current), the magnetic field lines curl around the wire. (a) East of wire: Field is directed **south**. (b) West of wire: Field is directed **north**. (c) Vertically above wire: Field is directed **west**. (d) Vertically below wire: Field is directed **east**.

All Questions in this Chapter

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