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Ballistic galvanometer : ウィキペディア英語版 | Ballistic galvanometer
==Ballistic Galvanometer== A ballistic galvanometer is a galvanometer in which an impulse is applied to the coil of the galvanometer due to the passage of a transient current or charge and the subsequent motion of the coil is used to determine the magnitude of the impulse, and, hence the quantity of charge to be measured. Like many other galvanometers, a ballistic galvanometer has a coil which rotates between magnets. The ballistic galvanometer has the special feature that its rotating coil has a large moment of inertia. It is used to measure quantity of charge rather than currents, for the large moment of inertia permits the passage of a quantity of charge before the coil moves significantly. The passage of the charge produces an impulse, a momentary torque, which causes the coil then to swing slowly to some maximum position. Such a galvanometer was often used to standardize capacitors. Ballistic galvanometer is a type of mirror galvanometer. Unlike a current measuring galvanometer, the moving part has a large moment of inertia, thus giving it a long oscillation period. It is really an integrator measuring the quantity of charge discharged through it. It can be either of the moving coil or moving magnet type.
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