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Alternating Current
Question
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A current I flows along the length of an infinitely long, straight, thin walled pipe. Then 

  • the magnetic field is zero only on the axis of the pipe

  • the magnetic field is different at different points inside the pipe

  • the magnetic field at any point inside the pipe is zero

  • the magnetic field at all points inside the pipe is the same, but not zero

Answer

C.

the magnetic field at any point inside the pipe is zero

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