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一、填空题
1.磁场 地磁场
2.顺时针 增强
3.略
4.电磁感应 磁场
5.导体切割磁感应线方向(导体运动方向) 磁感线方向
6.吸引 弹簧(或弹力) 弹性势 动
二、选择题
7.C
8.D
9.B
10.D
11.C
12.C
13.D
14.C
三、作图题:略
四、实验与探究题
19.(1)同一个电磁铁,通过线圈的电流越大,电磁铁的磁性越强;(2)外形相同的电磁铁,电流一定时,线圈匝数越多磁性越强。因为,当电磁铁的强弱与通过的电流和匝数两种因素有关时,为了研究磁性强弱与匝数的关系,应控制电流相同。
20.略