描述
當固定線圈通有電流I1時,在其內(nèi)部產(chǎn)生磁場(磁感應強度為B1),可動線圈中的電流I2與此磁場相互作用,產(chǎn)生大小相等、方向相反的兩個力(圖5),其大小則與磁感應強度B1和電流I2的乘積成正比。而B1可以認為是與電流I1成正比的,所以作用在可動線圈上的力或儀表的轉動轉矩與兩線圈中的電流I1和I2的乘積成正比
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