【练习】第10章 电生磁和磁生电
Authored by 白佩珊（古晋四中） 白佩珊（古晋四中）
Science
8th Grade
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如图所示，当开关S闭合时，通电螺旋管周围的小磁针指向不正确的是
a
b
c
d
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如图所示，能正确地表示出通电螺线管极性和电流方向关系的是
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下哪些因素会影响电磁铁磁性的强弱?
I 电流的方向
II 线圈的匝数
III电流的强弱
IV 铁屑的多少
I, II
I,III
II,III
II,III,IV
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
要增强电磁铁的磁性，下列措施可行的是
减小电磁铁线圈的匝数
延长电磁铁的通电时间
增大通过电磁铁线圈的电流
改变电磁铁线圈中的电流方向
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
关于通电直导线周围磁场的磁感线分布，下列示意图中正确的是
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