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A parallel plate capacitor of area A and separation d is provided with thin insulating spacers to keep its plates aligned in an environment

 

A parallel plate capacitor of area A and separation d is provided with thin insulating spacers to keep its plates aligned in an environment of fluctuating temperature, if the coefficient of thermal expansion of material of the plate is a, find the coefficient of thermal expansion (as) of the spacers in order that the capacitance does not vary with temperature. (Ignore effect of the spacers on capacitance). ZZ Ls ds of

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