Verified Solution • 2025–26 Session moderate

QPages 248-249: Q4: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Pages 248-249: Q4 Solution: A circular loop is kept in that vertical plane which contains…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume the magnetic field direction reverses on opposite sides of the loop's center, confusing it with the field of a magnetic dipole or a straight wire. Remember that for a current loop, the axial magnetic field points in the same direction on both sides of the plane (from South to North pole), so it is East at both A and B.

A circular loop is kept in that vertical plane which contains the north-south direction. It carries a current that is towards north at the topmost point. Let AA be a point on the axis of the circle to the east of it and BB a point on this axis to the west of it. The magnetic field due to the loop

Multiple Choice Options

  • A is towards east at AA and towards west at BB
  • B is towards west at AA and towards east at BB
  • C is towards east at both AA and BB
  • D is towards west at both A and B

Step-by-Step Verified Solution

**Answer:** (a) is towards east at A and towards west at B. **Step-by-Step Explanation:** The current at the topmost point is towards north. Using the right-hand rule, the magnetic field at the centre of the loop is towards east. On the axis, the field direction is the same (east) on both sides for points on the axis.

All Questions in this Chapter

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