Gandharv Walia · Business · 2026-09-05
In 1820, a French physicist invented an astatic needle which canceled out the
In 1820, a French physicist invented an astatic needle which canceled out the Earth's magnetic field. The device helped demonstrate the relationship between electricity and magnetism. The needle was based on a pair of magnetic needles placed in opposite directions. The arrangement reduced the effect of the Earth’s magnetic field on measurements. Reducing this effect allowed scientists to detect weaker electrical currents.
Why it matters. Why it matters: In 1820, a French physicist invented an astatic needle which canceled out the Earth's magnetic field.
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