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A current $I$ flows along the length of an infinitely long, straight, thin walled pipe. Then
  • A
    the magnetic field is different at different points inside the pipe
  • B
    the magnetic field at any point inside the pipe is zero
  • C
    the magnetic field at all points inside the pipe is the same, but not zero
  • D
    the magnetic field is zero only on the axis of the pipe
AIEEE 2007, Easy
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