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JEE Main · 2007 · 29 Apr 2007 · Offline · Magnetic Effects of Current

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A current I flows along the length of an infinitely long, straight, thin walled pipe. Then
  1. (A)the magnetic field is zero only on the axis of the pipe
  2. (B)the magnetic field is different at different points inside the pipe
  3. (C)the magnetic field at any point inside the pipe is zero✓ Correct
  4. (D)the magnetic field at all points inside the pipe is the same, but not zero

Answer: (C)

Solution

Apply Ampere's law to a circular loop drawn entirely inside the hollow pipe. Because the current travels only along the thin wall, any such interior loop encloses no current, so . With zero enclosed current for every loop that can be drawn inside, the magnetic field is zero at every point in the interior of the pipe.

JEE Main · 2007 · 29 Apr 2007 · Offline · Single correct option

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