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。
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。
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。
Move a bar magnet near one or two coils to make a light bulb glow.
在一两枚硬币附近移动磁棒来让灯泡发光。
The inverse effect also occurs: a spinning bar magnet will cause a suspended copper disk to rotate.
逆效应，也会发生：纺纱条形磁铁将导致暂停铜磁盘旋转。
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。
A bar on horseshoe magnet is called a permanent magnet.
棒形或马蹄形磁体称为永磁体。
Bar permanent magnet as the main part of the polarized magnetic system is widely used in polarized relay.
条形永久磁铁广泛应用于极化继电器中，是构成极化磁系统的主要组成部分。
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。
Explore the interactions between a compass and bar magnet.
探究指南针和磁棒之间的相互作用。
Magnetism of the bar magnet is produced by the surface molecule electric current.
磁块的磁性，是由磁块的表面分子电流产生的。
The action of the magnetic force moment and the magnetic force on the bar magnet in the magnetic field can be considered as that of wire circles through the magnetic field.
磁块在磁场中受到的磁力矩和磁力的作用也可看成通磁场对通电线圈的作用。
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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