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The secret is in the number of coils.
秘密在于线圈的数量。
Which means that the induced emf in a coil of wire is equal to the number of coils, times the change in magnetic flux over the change in time, all multiplied by a negative sign.
这意味着线圈中的感应电动势为 等于线圈数乘以磁通量随时间变化的变化,全部乘以负号。
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