磁场
Magnetic Fields
描述磁极（北极和南极），解释磁极之间的吸引和排斥，说明如何使用指南针绘制磁场线，并解释地球磁场及其实际用途。
Describe magnetic poles (north and south), explain attraction and repulsion between poles, describe magnetic field lines plotted using a compass, and explain the Earth's magnetic field and its practical uses
学习证据 / Evidence
- 阐述磁极吸引和排斥的规律
- 凭记忆或根据指南针读数画出条形磁铁周围的磁场分布图
- 解释指南针的指针为什么指向北方
- 解释地球具有磁场，并描述地球磁场如何用于导航
- States the rule for attraction and repulsion of magnetic poles
- Draws the magnetic field pattern around a bar magnet from memory or compass readings
- Explains why a compass needle points north
- Explains that the Earth has a magnetic field and describes how it is used for navigation
评估问题 / Assessment
如果{{name}}用指南针和铁屑来描绘条形磁铁周围的磁场，他们能否描述出磁场线的形状，并解释为什么指南针的指针总是指向大致北方？
If {{name}} used a compass and iron filings to map the magnetic field around a bar magnet, could they describe what pattern the field lines make and explain why a compass needle always points roughly north?