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Galvanometer01:24

Galvanometer

Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of  two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform magnetic...

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相关实验视频

Updated: Jul 12, 2026

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

测量人员v:磁体实验 测量人员v:磁体实验

J N de Wys

    Science (New York, N.Y.)
    |November 3, 1967
    PubMed
    概括

    在月球上发现了铁.

    科学领域:

    • 月球地质学 月球地质学
    • 太空探索 太空探索

    背景情况:

    • 探测器V任务的目的是分析月球表面的组成.
    • 一个永久磁铁被用来在着陆过程中与月球 regolith 相互作用.

    研究的目的:

    • 为了确定月球表面上的铁的存在和形式.
    • 将月球物质的特性与地球样本进行比较.

    主要方法:

    • 分析了Surveyor V脚板上的永久磁铁上粘附的月球物质的图像.
    • 进行实验室实验,使用陆地岩石和不同量添加的铁粉.
    • 将月球上的视觉数据与模拟的地球条件进行比较.

    主要成果:

    • 月球表面的物质被磁铁吸引,表明存在铁磁元素.
    • 吸引的月球物质的数量表明自由铁的度很低.
    • 相互作用模式最接近于没有添加铁的陆地玄武岩.

    结论:

    • 铁在月球表面以一种形式存在,这种形式被500高斯磁铁所吸引.
    • 月球表面自由铁的度有限,可能不到1%的体积.
    • 月球土壤的组成类似于陆地高原玄武岩,含有最小的自由铁.

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