Hi am Mohamed i would like to get details on physics investigatory project on tangent galvanometer ..My friend Justin said physics investigatory project on tangent galvanometer will be available here and now i am living at ......... and i last studied in the college/school ......... and now am doing ....i need help on ......
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The tangent galvanometer was first described in a paper of 1837 by Claude-Servais-Mathias Pouillet (1790-1868), who later used this sensitive form of galvanometer to verify Ohm's law. To use the galvanometer, it is first placed on a level surface and the coil is aligned with the north-south magnetic direction. This means that the compass needle in the center of the coil is parallel to the plane of the coil when no current is present. The current to be measured is now sent through the coil and produces a magnetic field perpendicular to the plane of the coil and directly proportional to the current. The magnitude of the magnetic field produced by the coil is B; The magnitude of the horizontal component of the earth's magnetic field is B '. The compass needle is aligned along the vector sum of B and B 'after rotating through an angle Ø from its original orientation. The vector diagram shows that so Ø = B / B '. Since the magnetic field of the earth is constant and B depends directly on the current, the current is therefore proportional to the tangent of the angle at which the needle has rotated.
It can be understood in the following video: