英语选择33333which of the following practice can increase the electromagnet A.larger increase in currentB.nailsC.increase in coil

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英语选择33333which of the following practice can increase the electromagnet A.larger increase in currentB.nailsC.increase in coil
英语选择33333
which of the following practice can increase the electromagnet
A.larger increase in current
B.nails
C.increase in coil

英语选择33333which of the following practice can increase the electromagnet A.larger increase in currentB.nailsC.increase in coil
这题感觉更像是物理题额
题目问的是下面哪种方法可以增强电磁铁的磁性
A是增大电流
B铁钉
C增加线圈匝数
根据物理学知识
影响电磁场的因素:电流的强度,线圈匝数,铁心的材质以及大小.增大磁性,可以增大电流,增加线圈匝数,增加铁心体积(用大一点的钉子就可以了).
B不够具体,所以选A和C吧

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