小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com专题13电磁感应目录01电磁感应定律及其应用····································································2考向一法拉第电磁感应定律的应用·····························································································2考向二“三个定则、一个定律”的综合应用·············································································5考向三自感、涡流、电磁驱动和电磁阻尼·················································································702电磁感应定律及其应用··································································12考向一电磁感应中的图像问题···································································································12考向二电磁感应中的电路问题···································································································15小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com01电磁感应定律及其应用考向一法拉第电磁感应定律的应用1．（2021·重庆·高考真题）某眼动仪可以根据其微型线圈在磁场中随眼球运动时所产生的电流来追踪眼球的运动。若该眼动仪线圈面积为S，匝数为N，处于磁感应强度为B的匀强磁场中，线圈平面最初平行于磁场，经过时间t后线圈平面逆时针转动至与磁场夹角为θ处，则在这段时间内，线圈中产生的平均感应电动势的大小和感应电流的方向（从左往右看）为（）A．，逆时针B．，逆时针C．，顺时针D．顺时针【答案】A【详解】经过时间t，面积为S的线圈平面逆时针转动至与磁场夹角为θ处，磁通量变化为，由法拉第电磁感应定律，线圈中产生的平均感应电动势的大小为，由楞次定律可判断出感应电流方向为逆时针方向。故选A。2．（2021·山东·高考真题）迷你系绳卫星在地球赤道正上方的电离层中，沿圆形轨道绕地飞行。系绳卫星由两子卫星组成，它们之间的导体绳沿地球半径方向，如图所示。在电池和感应电动势的共同作用下，导体绳中形成指向地心的电流，等效总电阻为r。导体绳所受的安培力克服大小为f的环境阻力，可使卫星保持在原轨道上。已知卫星离地平均高度为H，导体绳长为，地球半径为R，质量为M，轨道处磁感应强度大小为B，方向垂直于赤道平面。忽略地球自转的影响。据此可得，电池电动势为（）小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.comA．B．C．D．【答案】A【详解】根据，可得卫星做圆周运动的线速度，根据右手定则可知，导体绳产生的感应电动势相当于上端为正极的电源，其大小为，因导线绳所受阻力f与安培力F平衡，则安培力与速度方向相同，可知导线绳中的电流方向向下，即电池电动势大于导线绳切割磁感线产生的电动势，可得，解得。故选A。3．（2022·北京·高考真题）指南针是利用地磁场指示方向的装置，它的广泛使用促进了人们对地磁场的认识。现代科技可以实现对地磁场的精确测量。（1）如图1所示，两同学把一根长约10m的电线两端用其他导线连接一个电压表，迅速摇动这根电线。若电线中间位置的速度约10m/s，电压表的最大示数约2mV。粗略估算该处地磁场磁感应强度的大小B地；小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc...