15.A 9x10-11 F capacitor is made up of two circular plates (r=5cm) separated by 1.0mm. Find the necessary dielectric constant for this capacitor. Check your answer below. You must show work or no credit will be given for this problem. Answer = 1.34

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Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg