High frequency alternating current is passed through a solenoid that contains a solid copper core insulated from the coils of the solenoid. Which statement is correct?
A. A copper core remains cool no matter what the frequency of the current in the solenoid is.
B. The copper core remains cool because the induced emf is parallel to the solenoid axis and fluctuates rapidly.
C. The copper core heats up because an emf parallel to the solenoid axis is induced in the core.
D. The copper core heats up because circular currents around its axis are induced in the core.
E. The copper core heats up because the electric field induced in the copper is parallel to the magnetic field produced by the solenoid.
Answer: D
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