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My textbook asks the question: The phase of an Electromagnetic wave at a point P at some instant is 5pi. Which of the following statements about the field vector is true?
A)Both the electric and the magnetic field vectors are 0
B)The electric field is 0 and the magnetic field has its maximum magnitude
C)The electric field has its maximum magnitude and the magnetic field is 0
D)Both the electric and magnetic field vectors have their max magnitudes.
My question for this question is, is the textbook talking about phase difference? If so, how can the magnetic field and the electric field have a phase difference since it is originating from the same source?
Thank you to all who take the time to reply to my question!
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