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b) The function of the spring is to make the position of the needle proportional to the magnitude of the current. For this reason the spring must be chosen with care, for example: a spring with a...



b) The function of the spring is to make the position of the needle proportional to the magnitude of the current. For this reason the spring must be chosen with care, for example: a spring with a very strong elastic coefficient and the needle will hardly move. Hooke's law in terms of the torque on the needle as a function of angular displacement:
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b) The function of the spring is to make the position of the needle proportional to the magnitude of the current. For this reason the spring must be chosen with care, for example: a spring with a...
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