高考物理总复习-高中全程训练计划-物理-课练 29 电磁感应现象 楞次定律
课练29 电磁感应现象 楞次定律小题狂练○小题是基础 练小题 提分快1.[2019·江苏省泰州市黄桥中学模拟]如图所示,匀强磁场垂直圆形线圈指向纸内,a、b、c、d为圆形线圈上等距离的四点,现用外力在上述四点将线圈拉成正方形,且线圈仍处在原平面内,则在线圈发生形变的过程中( )A.线圈中将产生abcda方向的感应电流B.线圈中将产生adcba方向的感应电流C.线圈中的感应电流方向无法判断D.线圈中无感应电流答案:A解析:周长一定时,圆形的面积最大.现用外力在四点将线圈拉成正方形,线圈面积变小,磁通量变小,有感应电流产生,由楞次定律可知线圈中将产生顺时针方向的感应电流,故A正确.2.[2019...
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