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$\begingroup$ I don't think that is true. What is your source? $\endgroup$
– lmr
Commented Jun 9, 2018 at 10:30
3

$\begingroup$ @lmr You're right, Dynamo theory contradicts this answer. The moving water produces a secondary field, which is not the subject of this question. $\endgroup$
– user191954
Commented Jun 9, 2018 at 10:56

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