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Yes, the iPad Air2020 (4th generation) supports wireless charging.
The iPad Air 2020 uses the Qi standard wireless charging technology, and you only need to put it on a wireless charger that supports the Qi standard to wireless charging. At the same time, the iPad Air 2020 also supports wired charging through the Lightning port.
You can't. The 2020 tablet won't be able to use a wireless charger.