Verified Solution • 2025–26 Session moderate

QPage 249: Q6: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Page 249: Q6 Solution: In a coaxial, straight cable, the central conductor and the…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often incorrectly assume the magnetic field is non-zero outside the cable or fail to recognize that the net enclosed current is zero for any Amperian loop outside the outer conductor. Remember that for a coaxial cable with equal and opposite currents, the fields cancel completely in the external region ($r > R_{outer}$) and at the center of the inner conductor ($r = 0$), but not in the dielectric region between them.

In a coaxial, straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero

Multiple Choice Options

  • A outside the cable
  • B inside the inner conductor
  • C inside the outer conductor
  • D in between the two conductors.

Step-by-Step Verified Solution

**Answer:** (a), (b). **Step-by-Step Explanation:** For a coaxial cable with equal and opposite currents, B = 0 outside the cable (a) and inside the inner conductor (b).

All Questions in this Chapter

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