[Physics] Permanent Magnetic Field vs Electromagnetic Field

electromagnetismmagnetic fields

If I put a permanent magnet under a box and an energized electromagnetic coil under another box could you tell me which box was covering the permanent magnet? If the answer is yes what test would you use?
Note: The coil is receiving a steady dc current.

Best Answer

The box containing the coil will heat up more and more due to the joule effect. So measuring the temperature you could tell.

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