【单选题】【消耗次数：1】
若电源电压保持不变，变压器在空载和负载状态产生的主磁通φm其值_____
①
完全相等；
②
基本相同；
③
根本不同
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一台单相变压器，原边阻抗和折算后的付边阻抗相等，若此变压器在额定电压下短路? （指稳态短路），此时铁芯中的磁通_____。
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