Physics, 19.11.2020 18:00, ALEX33333

Question 4 of 20 What is required for an electromagnet to produce a magnetic field that is strong enough to be useful? A. A coil of wire with current running through it B. A permanent magnet C. A magnetic metal core with wire wrapped around it D. A magnetic metal core

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Question 4 of 20 What is required for an electromagnet to produce a magnetic field that is strong en...