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JEE Main2004PhysicsMagnetic Effects of CurrentActual

A current I ampere flows along an infinitely long straight thin-walled tube, then the magnetic induction at any point inside the tube is

Options

  1. Ainfinite
  2. Bzero
  3. C₀ 4 2 i r tesla
  4. D2 n^2 ~B

Correct answer

B. zero

Step-by-step solution

Considering Ampere's loop (shown by dotted line), no current is enclosed by this loop. Therefore, the magnetic field will be zero inside the tube.

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