Air friction damping is used in the instruments which is
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Air friction damping is used in the instrument which is in vertical position
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Air friction damping is used in the instruments which are in vertical position like in moving iron instruments.
There will always a resistance to an object which is in motion through a viscous medium or on a surface. The reason behind is effect is that the interaction between the surfcae of the object and it's surrounding (environment).
This force acting between them is known as friction.
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