The Earth's magnetic field is roughly like that of a bar magnet, with two opposite poles.
地球的磁场大致就像是一块拥有两个磁极的磁铁。
My 12 year old had a lesson in his science course later that day that mapped magnetic fields of a little bar magnet.
当天的晚些时候，我12岁的大儿子在他的自然科学课上绘制了一幅磁铁的磁场分布图。
My 12 year old had a lesson in his science course later that day that mapped magnetic fields of a little bar magnet. He showed me the results.
当天的晚些时候，我12岁的大儿子在他的自然科学课上绘制了一幅磁铁的磁场分布图。他向我展示他的成果。
Explore the interactions between a compass and bar magnet.
探究指南针和磁棒之间的相互作用。
The magnetic state of a bar magnet or a horseshoe magnet is extremely complicated.
条形磁铁或马蹄形磁铁的磁态是极其复杂的。
If the bar magnet is simply held stationary near the coil, no current is indicated.
如果磁棒单纯静止在线圈附近，就检测不到电流。
The voltage pulse induced by a bar magnet as it moves at constant velocity through the axis of a circular coil is analyzed.
分析了条形磁铁沿线圈轴向匀速通过线圈时感应引起的电压脉冲。
This system adopts 16 bits MCU as the core control device to achieve a bar magnet exactitude measure of small range displacement.
系统采用十六位单片机作为核心控制器件，实现磁棒小范围位移的精确测量。
This system adopts 16 bits MCU as the core control device to achieve a bar magnet exactitude measure of small range displacement.
系统采用十六位单片机作为核心控制器件，实现磁棒小范围位移的精确测量。
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