ELTSR02
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How strong does a permanent magnet/electromagnet need to be in order to see the effects of magnetic braking on a flat metal pendulum?
Magnetic Braking: Pendulum Strength Req. for Effects
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With that wealth of detailed information in your question, I'd say the answer is "some".
Welcome to the PF.ELTSR02 said:
As you can tell, we would need a lot more information in order to give you a ballpark estimate. But even better would be if you read through some background information (encyclopedia-type) articles, and link to them and ask specific questions about what you don't understand. The Wikipedia article on "Eddy Current Brake" looks to be a good place to start.