5. The RF capacitance gauge is used to estimate the height of fluid in a tank. When the tank is empty, the capacitance is 2 x 10° pF. When the liquid is poured in the tank, the capacitance drops to i x 10 pF. The separation between the plates is 50 mm and the dielectric constant of the fluid is 0.1. The width of the electrodes is w meter. Tank shell
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