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Gaokao Physics Practice Question

一电器中的变压器可视为理想变压器, 它将 $220 \mathrm{~V}$ 交变电流改变为 $110 \mathrm{~V}$, 已知 变压器原线圈匝数为 800 , 则副线圈的匝数为

  1. A.200
  2. B.400
  3. C.1600
  4. D.3200

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