High Frequency Alternating Current Is Passed Through a Solenoid That

question 40

Multiple Choice

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.

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