Which statement is correct for the phenomenon of periodic electromagnetic induction in a rotating coil?

  • A
    Phase difference between induced $emf$ and induced current is $\pi$.
  • B
    Phase difference between induced $emf$ and induced current is zero.
  • C
    Phase difference between induced $emf$ and induced current is $\pi / 2$.
  • D
    Frequency of all induced parameters is double the rotational frequency of the coil.

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