Discussion
Consider the following statements about the displacement current.
1. It involves no motion of charge 2. It produces a magnetic field 3. It is negligible in copper at power frequency
Answer: C
All three are correct. It is the rate of change of electric flux rather than any current of charge, it enters Ampere's law on the same footing as conduction current, and in copper the ratio \( \omega\epsilon/\sigma \) makes it vanishingly small at fifty hertz.
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