Answer
Magnetic flux inside the coil changes its direction depending on the direction of the winding and that of the current flowing through the winding. This results in noise performance differences under different service conditions. For this reason, the coil is provided with the polarity marks that give the user a reference position for coil configuration when the direction of coil mounting needs to be regulated. However, mounting the coil in the wrong direction hardly poses a problem; it does not affect the characteristics and reliability of the capacitor at all.
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Power Inductors for Automotive application
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