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What is an electromagnet? A. a solenoid with a ferromagnetic core B. a magnet that's electrically pulsed C. a solenoid with no core D. All of the above E. none of the above
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What is an electromagnet? A. a solenoid with a ferromagnetic core B. a magnet that's electrically pulsed C. a solenoid with no core D. All of the above E. none of the above

User Paco Zevallos
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D because not one of the has one of the things tha it can show

User Jmoz
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