why is the coil of dead -beat galvanometer wound on metal frame?
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Explanation:
When current is passed through a galvanometer, the coil oscillates about its mean position before it comes to rest. To bring the coil to rest immediately, the coil is wound on a metallic frame. Now, when the coil oscillates, eddy currents are set up in the metallic frame which opposes further oscillations of the coil. This in turn enables the coil to attain its equilibrium position almost instantly
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