05-10-2017, 09:10 AM
Hi, i am tapan , iwould like this project
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to study the earth magnetic field using a tangent galvanometer project pdf
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Hi, i am tapan , iwould like this project
19-10-2017, 10:04 AM
The tangent galvanometer was first described in 1837 by Claude-Servais-Mathias Pouillet, who later used this sensitive form of galvanometer to verify Ohm's law. To use the galvanometer, it is first configured on a level surface and the coil is aligned with the north-south magnetic direction. This means that the compass needle in the middle 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 is 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 through which the needle has rotated.
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