CUET · PHYSICS · PYQ PAPER 2023
If a current of I A flows along an infinitely long straight tube of radius R, the magnetic induction at any point inside the tube at a distance r from the axis of the tube (r < R) is:
- A 0
- B \( \infty \)
- C \( \frac{\mu_0 I}{2r} \)
- D \( \frac{\mu_0 I}{2\pi r} \)
Answer & Solution
Correct Answer
(A) 0
Step-by-step Solution
Detailed explanation
Current is on the surface of the tube. For \(r By Ampere's Law: \(\oint \vec{B} \cdot d\vec{l} = \mu_0 I_{enc} \Rightarrow B(2\pi r) = \mu_0 (0)\). \(B = 0\).
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