[問題] 電容
請問有一平行板電容
要再中間放入一個 slab of copper
若知
the work is done on the slab as it is inserted 是負的
那請問 Is the slab sunked in or pushed in?
我是覺得是 pushed in
因為做負功,代表我要給他能量,所以要pushed in
but the answer is sucked in
thx
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