Capacitance of a capacitor made by a thin metal foil is 2μF . If the foil is folded with paper of thickness 0.15mm , dielectric constant of paper is 2.5 and width of paper is 400mm , then length of foil will be
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Capacitance of a capacitor made by a thin metal foil is 2μF . If the foil is folded with paper of thickness 0.15mm , dielectric constant of paper is 2.5 and width of paper is 400mm , then length of foil will be