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galvanometer definition

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consists of a coil of wire suspended in the magnetic field of a permanent magnet.  When current flows through this coil of wire, the magnetic field exerts a torque on the loop, which is opposed by a spring.  When you attach a pointer to this coil, you get an analog readout of the current.

See also:

front-to-back alignment definition
frame rail definition
fraction of good field definition
gallium arsenide (GaAs) definition
gas cylinder definition