Describe the working principle of a moving coil galvanometer.
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Answer:
Moving coil galvanometer is an instrument used for the detection and measurement of small currents. Principle: The working of moving coil galvanometer is that when a current carrying coil is placed in a varying magnetic field, it experiences torque. ... Also, it increases the strength of the magnetic field.
The moving coil galvanometer working principle is based upon the fact that when electric current flows in a coil placed in a magnetic field, a deflecting torque acts upon the coil whose magnitude depends upon the strength of the current.
From the measurement of the deflection of the coil, the strength of the current can be computed.
Moving-coil galvanometers are of two types:
Suspended coil galvanometer and,
Pivoted-coil or Weston galvanometer.
The principle and working of the two types of galvanometers are the same, only there is some difference in their constructions..
In a suspended coil galvanometer, the coil is suspended by a thin phosphor bronze strip and the deflection of the coil is measured by a lamp and a scale arrangement. A suspended coil galvanometer can measure currents of the order of 10-9 A....