Verified Solution • 2025–26 Session moderate

QPage 249: Q7: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Page 249: Q7 Solution: A steady electric current is flowing through a cylindrical…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume the magnetic field is maximum at the center due to the proximity of current elements, but symmetry dictates that the vector contributions from diametrically opposite current elements cancel exactly at the axis, resulting in $B=0$.

A steady electric current is flowing through a cylindrical conductor.

Multiple Choice Options

  • A The electric field at the axis of the conductor is zero.
  • B The magnetic field at the axis of the conductor is zero.
  • C The electric field in the vicinity of the conductor is zero.
  • D The magnetic field in the vicinity of the conductor is zero.

Step-by-Step Verified Solution

**Answer:** (b). **Step-by-Step Explanation:** For a cylindrical conductor carrying steady current, the magnetic field at the axis is zero (b). The electric field is not zero (a is wrong).

All Questions in this Chapter

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