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QPage 248: Q1: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Page 248: Q1 Solution: An electric current flows in a wire from north to south. What…
⚠️ 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**.
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