摩擦过的气球为什么能吸起小纸屑？
Why does a rubbed balloon pick up paper bits?
气球在头发上摩擦后会带电，电就把轻轻的纸屑吸了过来。
After rubbing on hair, the balloon gets electric charge that pulls tiny paper bits to it.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
梁灿彬 等,《电磁学》,高等教育出版社,2004
Liang Canbin et al., Electromagnetism, Higher Education Press, 2004
#静电 #吸附
电池怎么让小灯亮？
How does a battery light a bulb?
电池送出电，电线把电送到灯泡里，灯泡就亮了。
The battery sends electricity through wires to the bulb, and the bulb lights up.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
梁灿彬 等,《电磁学》,高等教育出版社,2004
Liang Canbin et al., Electromagnetism, Higher Education Press, 2004
#电池 #电
电线连起来小灯怎么亮？
How do wires make a bulb light up?
电池、电线和灯泡连成一个圈，电沿着圈跑，灯泡就亮了。
Battery, wires, and bulb form a loop, and electricity runs around it to light the bulb.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
梁灿彬 等,《电磁学》,高等教育出版社,2004
Liang Canbin et al., Electromagnetism, Higher Education Press, 2004
#电路 #电
为什么磁铁能吸铁？
Why can magnets attract iron?
磁铁有磁场，能改变铁内部微小磁域的方向，使铁被吸引。
A magnet's field aligns tiny domains inside iron, pulling it closer.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03
来源 · Source
Griffiths，《电动力学导论》（第4版）
Griffiths, 'Introduction to Electrodynamics' (4th ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-1-108-35938-2 (4th ed., Cambridge Univ. Press)
#磁场 #磁性 #铁
静电到底是怎么产生的？
How is static electricity actually made?
摩擦时电子从一个物体跳到另一个物体上，两边就带上了相反的静电。
Rubbing makes electrons jump from one object to another, leaving both with opposite static charges.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
梁灿彬 等,《电磁学》,高等教育出版社,2004
Liang Canbin et al., Electromagnetism, Higher Education Press, 2004
#静电 #电子
磁铁为什么能吸引铁？
Why can a magnet attract iron?
铁等铁磁材料内部有许多微小的磁畴，平时方向杂乱。外磁场会让这些磁畴趋向对齐，使铁整体被磁化并受到磁场吸引。一旦撤去外场，部分磁性可能保留，这就是永磁体。
Ferromagnetic materials like iron contain many tiny magnetic domains that are normally random. An external field aligns these domains, magnetizing the iron so it is attracted. Removing the field can leave some magnetization behind, which is how permanent magnets form.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
梁灿彬 等,《电磁学》,高等教育出版社,2004
Liang Canbin et al., Electromagnetism, Higher Education Press, 2004
#磁铁 #铁磁 #磁畴
开关怎么控制灯亮和灯灭？
How does a switch control a light turning on and off?
开关合上时电路连成一圈，电通了灯就亮；断开时电停了灯就灭。
Closing the switch completes the loop so electricity flows and the light turns on; opening it stops the flow and the light goes off.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
梁灿彬 等,《电磁学》,高等教育出版社,2004
Liang Canbin et al., Electromagnetism, Higher Education Press, 2004
#开关 #电路