A galvanometer is an instrument used to indicate the presence, direction, or strength of an electric current. In 1820, scientists found the first connection between electricity and magnetism when they discovered that electric currents create magnetic fields. This particular galvanometer is an astatic galvanometer, which has two needles with opposite polarities that cancels out the effect of the Earth’s magnetism. As a result, the sensitive instrument can detect the electric current without magnetic interference.

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