Abstract
A moving-coil galvanometer is ballistic if the inertia of the suspended coil assembly is large and the restoring torque and damping are small. If a pulse of charge is passed through the coil, the pulse may be completed before appreciable movement of the coil has occurred and the amplitude of the consequent oscillation is proportional to the total charge of the pulse. It has been found that the couple because of current i in the coil at any instant is given by NABi , where N is the number of turns of the coil, A is the area enclosed by each turn, and B is the flux density of the radial field in which the coil moves.
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