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QPage 249: Q5: HC Verma: Concepts of Physics - Volume 2 Magnetic Field Due to a Current Page 249: Q5 Solution: A hollow tube is carrying an electric current along its length…
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often apply Ampere’s law to a hollow tube and assume the field inside is non‑zero because current flows along the surface. In fact, for any Amperian loop that lies entirely inside the shell, the enclosed current is zero, so $B$ must be zero everywhere inside the tube—not just at the axis. Misreading “constant inside” as a non‑zero constant leads to the wrong answer.
A hollow tube is carrying an electric current along its length distributed uniformly over its surface. The magnetic field
Multiple Choice Options
- A increases linearly from the axis to the surface
- B is constant inside the tube
- C is zero at the axis
- D is zero just outside the tube.
Step-by-Step Verified Solution
**Answer:** (b), (c).
**Step-by-Step Explanation:**
For a hollow tube, B = 0 inside (constant at zero) and zero at the axis.
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