The Solenoid Galvanometer
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-381
2025-12-11
18
One principle used in the construction of galvanometers is that which determines the following phenomenon: If an iron rod is suspended with one end inside a coil of wire, the rod will be pulled into the coil as soon as a current is sent through the wire-the strength of the pull depending on the strength of the current used.
One advantage that the instrument has is that its controlling force is the action of gravity upon the weight on the balance arm. This insures that after its calibration has once been made it will remain constant. Figure 1 represents a commercial ammeter made on this principle.
It will be observed that the divisions on the scale are not equal. This is due to the fact that when the core is drawn into the coil, it is moving into a stronger magnetic field.
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