Two small metal spheres are far from each other and are connected by a metal wire with a switch in the middle (all metal objects here are conductors).Initially the switch is open. Sphere 1, with radius 12 cm, is given a positive charge, 12C. Sphere 2, with radius 8.0 cm, is given a positive charge, 3.0C. Required:
What is the initial voltage of each sphere?

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