Electric and magnetic fields are always interrelated to each other.
That is, a time-varying electric field is produced by a time-varying magnetic field.
Which of the following statements are true?
a) Electric and magnetic fields can be treated independently only if they vary in time.
b) A time-varying magnetic field will produce an electric field.
c) A time-varying electric field will produce a magnetic field.
d) Time-varying electric and magnetic fields can propagate through space only if there is no matter in their path.
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