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A current $I$ flows along the length of an infinitely long, straight and thin-walled pipe. Then
  • A
    The magnetic field at all points inside the pipe is the same but not zero
  • B
    The magnetic field at any point inside the pipe is zero
  • C
    The magnetic field is zero only on the axis of the pipe
  • D
    The magnetic field is different at different points inside the pipe
IIT 1993, Easy
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