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1. An air conditioner, comprising a first unit and a second unit, wherein the first unit is connected to the second unit by a connection power wire and a connection ground wire, the connection power wire feeding power from the first unit to the second unit, the connection ground wire connecting ground of the first unit to ground of the second unit, the first unit includes a capacitor connected between the connection power wire and the ground of the first unit, the connection power wire and the connection ground wire extend through a hole of a magnetic piece, and the magnetic piece is configured such that when current flows through the connection power wire and the connection ground wire from one of the first unit and the second unit toward the other one of the first unit and the second unit, an orientation of a magnetic flux produced in the magnetic piece by the current that has flowed through the connection power wire is identical to an orientation of a magnetic flux produced in the magnetic piece by the current that has flowed through the connection ground wire, wherein the first unit and the second unit respectively include a rectifier circuit and an inverter circuit.
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