Electromagnetic interference (EMI) is usually caused by the coupling of signals from one system to another.  There are many things that can be done to reduce the EMI on your device depending on  the source of the Electromagnetic interference. Shields are even available as solid enclosures or wire mesh covers that enclose your electronic device and protect it from the Electromagnetic interference. In many cases however a complete shielded enclosure is not practical because it reduces access to the device itself. If the Electromagnetic interference is caused by the charging adapter then adding a ferrite bead on the wire from your charging adapter to your device can reduce the EMI in many cases. For best results, The ferried bead should be placed close to the charging adapter instead of the device end of the wire.
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